1. In a strain of Drosophila, purple eyes are dominant to yellow eyes and eye co

Question

1. In a strain of Drosophila, purple eyes are dominant to yellow eyes and eye color is X-linked. What insects could you cross to ensure 100% purple eyed progeny?

A. yellow eyed female X purple eyed male

B. purple (homozygous) eyed female X yellow eyed male

C. purple (heterozygous) eyed female X yellow eyed male

D. A and B

E. A and C

2. A normal mum and a normal dad have an albino child. What is the probability of them having 2 more albino children.

A. ¼

B. ½

C. ¾

D. 1/16

E. none of the above

3. The process of epigenetics/ epigenesis involves

A. Changing the DNA sequence

B. Methylation of RNA

C Methylation of Thymine

D. Mutation of proteins

E. None of the above

4. X-chromosome inactivation is important in explaining the unexpected phenotype of females who are homozygous for X- linked genes.

A. True

B. False

5. Carriers of the sickle cell disease allele show ----------- during outbreaks of _______

A. heterozygote advantage/ ebola virus

B. recessiveness / famine

C. dominance/ flu

D. epistasis/ malaria

E. None of the above

6. Suppose that two parents have a daughter who is homozygous for the hemophilia allele.Then.......

A. both parents must also have the disease.

B. all sons of these parents must have the disease.

C. the father must have the disease

D. the mother must have the disease

E. none of the above.

7. Polar microtubules extend from the centrosome and connect to the centromere.

A. True

B. False

8. Human male gametogenesis results in 4 sperm while human female gametogenesis results in 2 eggs.

A. True

B. False

9. Chimpanzees and dogs have a larger diploid number than humans.

A. True

B. False

10. A metacentric centromere will result in a chromosome having a p and a q arm.

A. True

B. False

please explain the answer of multiple choice problems, thanks

Explanation / Answer

1) In drosophila, purple eye color is dominant over yellow eyes and is X linked. Females contain two x chromosomes and makes contain only one X chromosome. Therefore, in mating between homozygous purple eyed female and yellow eyed male, all the offsprings are purple colored. This is because in offsprings either females or males will receive one copy of X chromosome from the mother. So, the answer for this question is option B.

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