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Serjik [45]
3 years ago
13

Crossing over occurs during Prophase II. A. True B. False

Biology
2 answers:
Lemur [1.5K]3 years ago
8 0
False
crossing over occurs in prophase 1 of meiosis 1. The significance of this crossing over is to ensure cell differentiation. If this occurred in prophase two it means the cells in meiosis 1 will be identical.
gregori [183]3 years ago
5 0

Answer:

B. False

Explanation:

Crossing over not occurs in prophase II. It occurs only during prophase I.

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How is DNA and Protein Synthesis related?
lana66690 [7]

Explanation:

DNA is divided into functional units called genes. A gene is a segment of DNA that codes for a functional product (mRNA, tRNA, or rRNA). Since the vast majority of genes are transcribed into mRNA and mRNA is subsequently translated into polypeptides or proteins, most genes code for protein synthesis.

7 0
2 years ago
Colored aleurone in the kernels of corn is due to the dominant allele R. The recessive allele r, when homozygous, produces color
Pie

Answer:

The genes are linked, and the arrangement is coupled (one homolog has both dominant alleles; the other homolog has both recessive alleles).

RY / ry

Explanation:

R_= colored aleurone

rr= colorless aeurone

Y_= green plant

yy= yellow plant

They do a testcross between a plant of unknown genotype and phenotype and a plant that is homozygous recessive for both traits (yr/yr) the following F1 is obtained:

  • 88 Colored, green (RY/ry)
  • 92 colorless, yellow (ry/ry)
  • 8 colorless, green (rY/ry)
  • 12 colored, yellow (Ry/ry)

If the genes assorted independently, all of the possible offspring phenotypes would appear in the same frequency. However, they obtained 2 phenotypes much more abundant that the other two. Since recombination is a rare event during crossing over, when two genes are linked the recombinant gametes are produced less frequently than the parentals.

We can propose that the phenotypes Colored, green (RY) and colorless yellow (ry) are the parental gametes, and the unknown plant has the arrangement RY/ry, with both genes linked.

6 0
3 years ago
For what does your body use carbohydrates?
SVETLANKA909090 [29]

Answer:

A

Explanation:

Carbohydrates is your body's main source of energy. They help to fuel your brain, your kidneys, your heart muscles, and your central nervous system.

3 0
3 years ago
Which list correctly alligns the levels of organisms from the least to the most complex​
zepelin [54]

Answer:

cell > tissue> organ> system

Explanation:

6 0
2 years ago
In terms of gender differences in mental ability, research indicates that
Dmitriy789 [7]
There is no difference in mental abilities between genders
4 0
3 years ago
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