Answers
Explanation:
Meiosis makes genetic variety possible. It makes sperm & egg cells called gametes. Each gamete has 23 chromosomes. To make a diploid cell two gametes (sperm & cell) come together.
During prophase 1 the chromosomes pair up with their homologous pairs so they can transfer their genetic information and exchange it between each other. It makes recombinant chromosomes that influence the genetic diversity between the same people.
Now they are in metaphase 1, the chromosomes are in pairs in the middle of the cell. In anaphase 1, the chromosomes are pulled away by the spindle fibers. Then in telophase 1, there are two formed nuclei. Cytokinesis 1 then splits the cytoplasm.
Now they are in meiosis 2. During prophase 2, there are chromosomes and the spindles are starting to form again without crossing over like in prophase 1. In metaphase 2, chromosomes are going to line up in the middle in both cells unlike during metaphase 1 where the chromosomes were only in pairs. In anaphase 2, only the chromatids are being pulled away by the spindle fibers. Next in telophase 2 the nuclei reform and the 2 cells are each going to divide into 4 cells. Finally, cytokinesis completely splits the cytoplasm.
Keeping in mind that each sex only produces one type of gamete cell (sperm or eggs), and of the independent assortment and crossing over of chromosomes, the end result will be diversity.
Related Questions
DNA strands run in 1 of 2 directions depending on which end of the strand is free and which end has a phosphate bond. One direction is 5' to 3' (__________) and the other direction is 3' to 5' (downstream). __________ polymerase binds to the DNA at the TATA box and unzips the double helix. Working along the DNA chain, RNA polymerase reads the DNA nitrogenous bases and matches RNA nitrogenous bases from the nucleus (uracil instead of thymine). As it moves, RNA polymerase re-zips the DNA behind it and lets the mRNA separate from the DNA. It continues to do this until it reaches a sequence downstream called a __________ signal. In other words, RNA polymerase copies the DNA sequence downstream of the TATA box into an mRNA strand.
Answers
Answer:
The answers in the blank spaces:
1. Upstream
2. RNA
3. Terminator
Explanation:
This question is describing the process of transcription, which is the process whereby DNA template is used to synthesize an mRNA molecule. Transcription involves three stages viz: initiation, elongation and termination.
- DNA strands run in 1 of 2 directions depending on which end of the strand is free and which end has a phosphate bond. One direction is 5' to 3' (UPSTREAM) and the other direction is 3' to 5' (downstream). An enzyme called RNA polymerase binds to the DNA at the TATA box and unzips the double helix (INITIATION).
- Working along the DNA chain, RNA polymerase reads the DNA nitrogenous bases and matches RNA nitrogenous bases from the nucleus (uracil instead of thymine). As it moves, RNA polymerase re-zips the DNA behind it and lets the mRNA separate from the DNA (ELONGATION).
- It continues to do this until it reaches a sequence downstream called a TERMINATOR signal (TERMINATION). In other words, RNA polymerase copies the DNA sequence downstream of the TATA box into an mRNA strand.
Which is located at the beginning of a gene?
terminator
promoter
mRNA
intron
Answers
which of the following is an object used in relative dating
A-Carbon 14
B-Daughter Isotope
C-Index Fossil
D-Parent Isotope
i know for sure it’s not A
Answers
Using index fossils for age estimates of rock layers is not a new idea. For example..
1) if you have a fossil trilobite and it was found in the Wheeler Formation.
2) Ammonites were common during the Mesozoic Era. They were not found after the Cretaceous period
The object that is used in relative dating is Index Fossil. Thus, option C is correct.
What is Fossil records?
Fossil records are described as the position of found fossils all through the surface or the layers of the earth. The older the fossils are, the deeper it is found. Fossil records are also considered to be gathered information about the total number of the discovered fossils and the data obtained from them.
Fossil records are important guides to determine how life existed before. If you are to assemble a fossil, you will be able to see and tell the evolutionary changes that happened over the past years. Fossil records are evidences pointing out that life before is totally different from now.
Index fossils are fossils that are common yet were only present for a brief time. By comparing a rock layer to other rock layers, index fossils enable scientists to determine the relative age of a rock layer. Organisms that are still alive today yet have undergone little alteration over millions of years are known as living fossils.
Therefore, The object that is used in relative dating is Index Fossil. Thus, option C is correct.
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Can someone explain the Punnett square ?
Answers
Answer:
so in the punnet square, you hvae the 4 squares inside the big on. on top of the square, you have 2 letters, representing the dominant and the repressed genes. On one side, typically the left, you have another two letters, again genes. to get the gene types to fill in your squares, you take the first letter of the top set and the first letter of the side set. for this example, we are going to use Bb(top) and BB(side). you would take the B from the top, and you would pu it with the B from the side. in the top left square, you should have BB. next, you go and take that same top B and do it with the second letter of the side, B again. this again gives you BB. next, you take the second letter of the top, b, and you join it with B. in the top right square, you would write or type in Bb. Even though the b was on top, it is after the B because in this cause, it is not the dominant gene. when you do the second top and side letters together, you again get Bb.
Explanation:
the main points.
in this example, i used B to be the dominant gene and b to be the repressed/ submissive gene. you always put the dominant gene letter before the repressedmake sure you fill the squares in properly. in this one, you should have 3 BB and 1 Bb. this shows that the gene set BB is going to showwhen you fill in the squares, the first top letter and the first side letter fill in the top left square.the first top letter and the second side letter go left bottom.second top letter and first side letter go in right top.second top and second side go in right bottom.always place the dominant gene first in the punnet square.add me and message me if you need more help. we can also zoom to figure it out.
11. Cheetahs have been through a genetic bottleneck; evidence for this is that
A little natural selection occurs in this species.
B. the body is long thin, and graceful.
c. there is very little genetic variability.
D. these cats are members of an endangered species.
E. they originally came from sm all areas of Africa.
Answers
Cheetahs have been through a genetic bottleneck; evidence for this is that there is very little genetic variability (Option c).
What is a genetic bottleneck?A genetic bottleneck is a natural process where a population and/or species lost part of this genetic diversity.
A genetic bottleneck is a process that can be caused by catastrophic natural disasters.The genetic bottleneck is evidenced by the lack of genetic variability.In conclusion, cheetahs have been through a genetic bottleneck; evidence for this is that there is very little genetic variability (Option c).
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In mice brown fur (B) is dominant to white fur (b). Two brown mice mate. Their genotype in unknown. You observe the offspring and notice 5 are brown and 2 are white. Given this information, you determine both parent genotypes must be:
a. BB
b. Bb
c. bb
d. a reliable conclusion can't be reached
Answers
Answer:
bb bc there more alike
but i am not so sure
According to the data in the table, what percent of the elodea cells is water? Explain how you arrived at this conclusion.
Answers
Answer:
99%
Explanation:
at a salt solution concentration of 2%, plasmolysis first started to occur. So the other 98% in the "solution" would have just been water. Since water inside cells needs to be greater than the amount of water outside the cells, we can say that the amount of water inside the elodea cells was 99% so that it can allow hypertonic plasmolysis to occur.
good luck in honors bio>.<
In a simulation of genetics, a child inherits either a dominant or recessive
allele from each parent. Which of the following would be the best method for
randomly determining which of two possible alleles a child inherits from the
father?
A. Drawing from a deck of cards printed with either an uppercase or
lowercase a
B. Blindly selecting from a bag filled with blue, green, red, and yellow
beads
C. Throwing a dart at a dartboard hanging on a wall at a distance of
10 feet
D. Rolling a six-sided number cube and using the number on the top
side
SUBMIT
PREVIOUS
No
Answers
The gene inherited from the father is best obtained by rolling a six-sided number cube and using the number on the top side.
What is genetics?Genetics is the science that seeks to study the patterns of inheritance in individuals. It deals with the study of genes which often occur in pairs called alleles.
The best way to determining which of two possible alleles a child inherits from the father is rolling a six-sided number cube and using the number on the top side.
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Answer:
A. Drawing from a deck of cards printed with either an uppercase or
lowercase a
or
A. Drawing from a deck of cards printed with either an uppercase or
lowercase Q
Explanation:
Is nature or nurture more important
Answers
Answer:
Yes
Explanation:
cus
it keeps us alive
Nature can go from describing events out of our control, innate feelings, to describing the area we are raised in. Nature can go a long way with raising kids, in comes the theory’s of the “murder gene.” The aforementioned gene is a theory on the “murderous” behaviors in children sociopaths, or psychopaths. This theory exists because of some unexplainable behaviors the children have that were not taught, like hurting animals and lack of empathy.
In a more lose interpretation of Nature it can mean the area children are raised in. Like the different between a trailer park and a mansion. But generally Nature refers to innate, uncontrollable, behaviors.
On the other hand Nurture refers to the actual raising of the child. Referring back to the “murder gene” the question is if you could reverse the effects of the gene in children based on how you raise them. Nurture is also an argument for how kind you should be to your child as they are growing.
Personally I think Nurture is more important, but in all actuality a good balance is best.
Can you tell me which go where?
Answers
Answer:
heredity goes to the first one
phenotype at the second one
Explanation:
kareem drew a diagram to compare flatworms and segmented worms
which label belongs in the area marked X?
a. can reproduce sexually
b. are always parasites
c. are all sessile
d. are covered in setae
PLEASE HELP
Answers
Answer:
Explanation:
A - can reproduce sexually
What happens to a mother offspring when a mutation is in her gamete cells
Answers
Answer: her child will have the mutation in all of his/her cells
Explanation:
(GIVING BRAINLIEST) ______________ energy is the total potential and kinetic energy of particles in an object.
Group of answer choices
Chemical
Nuclear
Thermal
Answers
Answer:
Thermal
Explanation:
The total kinetic and potential energy of the particles in an object is called thermal energy.
Which statements about freshwater sources are true? Check all that apply. B Only about 3 percent of Earth's water is fresh water Most of the fresh water on Earth is groundwater. About 75 percent of the fresh water on Earth is frozen in ice sheets. The largest source of usable fresh water is groundwater. More fresh water is in the atmosphere than in rivers and lakes.
Answers
Answer:
all but 3 percent
Explanation:
because i looked it up
Answer:
groundwater is correct
if you step on a sharp object muscles in your leg will rapidly put your foot away.
what is the correct term for this type of reaction?
Answers
Answer:
Explanation:
Sharp object the reaction is a reflex its involuntary and it doesn't involve ur brain it protects u from damage.So u step on the sharp object whihc is a stimulus so the reaction is reflex its quick and automatic.
Hope this helps
Molecules of DNA are composed of long chains of?
Answers
two long polynucleotide chains
A DNA molecule consists of two long polynucleotide chains composed of four types of nucleotide subunits. Each of these chains is known as a DNA chain, or a DNA strand. Hydrogen bonds between the base portions of the nucleotides hold the two chains together
Molecules of DNA are composed of long chains of nucleotides.
What are nucleotides?Nucleotides are the building blocks of DNA and RNA adenine (A), thymine (T), guanosine (G), and Cytosine (C. In RNA, uracil (U) is present instead of thymine.
The pentose sugar is the ribose sugar in RNA and deoxyribose sugar in DNA. In deoxyribose sugar, oxygen is absent from the 3' carbon.
Phosphate groups are attached through the 5-C of pentose sugar by an ester bond. One polynucleotide chain is formed when the phosphate of one nucleotide forms a phosphodiester bond with the sugar of another nucleotide.
A double-stranded structure is formed by base pairing between nucleotides. The adenine binds to thymine by two hydrogen bonds and guanine binds to cytosine by three hydrogen bonds.
Therefore the molecules of DNA are composed of long chains of nucleotides.
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The workers who paid a rate for every day they work are known as
Answers
Answer:
piece work
Explanation:
I hope this is right
8.
What is meant by the term base-pairing? How is base-paring involved in DNA replication?
Answers
Answer: Hydrogen bonds form only between specific base pairs. ase pairing ensures that the complementary strands produced are identical to the original strands.
Explanation:
all you need is in the photo
Answers
Which of the following statements about plankton or nekton is NOT correct?
a. Nekton are active swimmers.
b. Phytoplankton are important primary producers.
c. All plankton are closely related to plants.
d. Plankton drift or swim weakly.
e. Zooplankton are heterotrophic plankton.
Answers
Answer:
B is the answer
Explanation:
plants make their own food and in this case phytoplankton aslo plankton are known as plants
Color blindness is a X-linked recessive trait. A couple want to predict whether it would be possible for their child to be color blind. The female is an unaffected carrier and the male is red/green color blind. What percentage of offspring would be color blind?
Answers
Answer: There is a probability (n.b. NOT certainty) that half of all offspring will be colour blind.
Explanation: The female is XX and as an unaffected carrier we can assign genotype Cc where c is the recessive allele.
The male is XY and colour blind, so genotype cY
Male offspring can be cY or CY so p|colourblind = 50%
Female offspring can be Cc or cc so, again p= 50%
If there is also equal probability of sex of the offspring, there is an overall probability that half the offspring will be colour blind
HELPPPPPP MEEEEEEEEE PLZZZZZZZZZZ
Answers
Answer:
01). cells
02).seeing inside the cells
03).Robert hook
I'll give you a cookie if answered
Answers
Answer:
a mutation
Explanation:
becaus ethere are diffrent traits wich would be a mutation im in middle school i learned this is 2 so trust me.
Answer:
variation
Explanation:
Any difference between individual organisms or groups of organisms of any species caused either by genetic difference or by the effect of environmental factors is called variation. Variation is observed in physical appearance, metabolism, behavior, learning and mental ability, and other visible characters of an individual.
QUESTION: Which one of the following is likely to be most effective in reducing dental decay?
(a) Eating fibrous food, e.g. apples, after meals.
(b) Cutting down on sweets, biscuits etc. between meals.
(c) Cleaning the teeth after meals and at night.
(d) Using an antiseptic mouthwash.
help me plz
Answers
Answer:
It is between B and C I am 99.999% Sure its C but you might wanna check :))))
Explanation:
The freezing point of a mixture of water and salt is
A. higher than that of pure water
B. the same as that of pure water
C. lower than that of pure water
D. none of the above
Answers
Answer:
lower
Explanation:
salt makes thing freeze faster
Answer:
A
Explanation:
Because when you mix a mixture and pure substances it’s higher
Which macromolecule plays a central role as an energy source?
Answers
Answer:
Carbohydrates
Explanation:
Ex: Glucose (monosaccharide)
HELP PLEASE
At Love Canal in the 1970s, there was an environmental disaster. In response, the Superfund law was passed. Why can we view Love Canal and the creation of the Superfund as a positive environmental event?
A. It allowed the EPA to find toxic waste sites and force the responsible parties to clean up the sites.
B. It provided money to businesses responsible for toxic waste sites to clean up their pollution
C. It helped boost the economy among those waste sites
D. It helped identify toxic waste site and move people away from them
Answers
Answer:I’m stuck on the same question
Explanation:
Which of these characteristics is often used as a measure of an ecosystems health? A. The variety of species that lives there B. The number of people who live there C. The amount of population that occurs there D. The types of activities that can be done there
Answers
Answer:
A
Explanation:
Because the more species that live their can determine how well the environment is doing.And that their is enough resources for them to survive.
what is a cell that is the source of other cells
Answers
Answer:
stem cells
Explanation:
In a certain plant, yellow leaves are dominant (Y) and red leaves are recessive (y). Plant with genotype Yy and a plants with yy crust. If they have for offspring how many would you predict would have red leaves? (Hint: draw a punnett square to help you determine the answer)
Answers
Answer: 1
Explanation:
a p e x
Answer:
1
Explanation: