Problem 1. Which of the following most influences the development of a female fe

Question

Problem 1. Which of the following most influences the development of a female fetus?

a. the presence of any two sex chromosomes

b. the presence of two X chromosomes

c. the absence of a Y chromosome

d. the presence of a Y chromosome

e. either b or c

Problem 2. Why are more males than females affected by X-linked recessive genetic diseases?

a. because males have a Y chromosome that does not represent the same alleles as the X chromosomes and cannot mask the X-linked recessive allele

b. because females have an additional Y chromosome to mask the X-linked recessive allele

c. because females have an additional X chromosome to mask the X-linked recessive allele

d. Females are affected more by X-linked recessive genetic diseases because they have two X chromosomes.

e. a and c

Problem 3. Which of the following couples could have a boy with Duchenne muscular dystrophy (DMD)?

a. a male with DMD and a homozygous dominant female

b. a male without DMD and a homozygous dominant female

c. a male without DMD and a carrier female

d. a and c

e. none of the above

Problem 4. Predict the sex of a baby with an X sex chromosome.

a. male

b. female

c. cannot determine with the chromosome information given

Problem 5. Which of the following inheritance patterns includes an environmental contribution?

a. polygenic

b. X-linked recessive

c. X-linked dominant

d. multifactorial

e. none of the above

Problem 6. How is codominant inheritance different from incomplete dominant inheritance?

a. In codominance, one gene is recessive to two dominant genes; in incomplete dominance, all genes are recessive.

b. In codominance, all genes are recessive; in incomplete dominance, one gene is recessive to two dominant genes.

c. In codominance, two alleles are expressed equally; in incomplete dominance, there is only one allele in the system.

d. In codominance, two alleles are expressed equally; in incomplete dominance, neither the dominant or recessive phenotype is seen in heterozygotes.

e. In codominance, the two alleles cooperate to make an intermediate phenotype; in incomplete dominance, the heterozygote shows the recessive phenotype.

Problem 7. What are the chances that a curly-haired father and a straight-haired mother can give birth to a child with curly hair?

a. 0%

b. 25%

c. 50%

d. 75%

e. 100%

Problem 8. What is different about red blood cells from a person with type AB blood, compared to those from other blood types?

a. They carry Rh markers, whereas other blood types have none.

b. They carry A and B type surface markers, so they are universal acceptors of blood.

c. They carry A and B type surface markers, so they are universal donors of blood.

d. They carry A and B type surface markers, so they cannot receive or donate blood.

e. They have no surface markers from the ABO blood type alleles.

Problem 9. Which of the following contain the normal chromosome number?

a. a human egg – 46; a human sperm – 23; a human zygote – 23

b. a human egg – 46; a human sperm – 46; a human zygote – 23

c. a human egg – 46; a human sperm – 46; a human zygote – 46

d. a human egg – 23; a human sperm – 23; a human zygote – 46

e. a human egg – 23; a human sperm – 23; a human zygote – 23

Problem 10. Which of the following can result in a trisomy such as Down syndrome?

a. an egg with 23 chromosomes fertilized by a sperm with 22 chromosomes

b. an egg with 22 chromosomes fertilized by a sperm with 23 chromosomes

c. an egg with 24 chromosomes fertilized by a sperm with 23 chromosomes

d. an egg with 22 chromosomes fertilized by a sperm with 24 chromosomes

e. b and d

Explanation / Answer

ANSWERS:

1. E. Either b or c

2. E. a and c

4. c. Cannot determine with the chromosome information given ( because female has XX and male has XY sex chromosomes)

5. Multifactorial inheritance pattern includes an environmental contribution.

7. Parents: CC X CC

Gametes: C,C C,C

F1 generation : CC , CC , CC , CC ----------> all curly hair ( curly hair is a dominant trait)

Ans: 100%

8. b. AB blood group carry A and B surface markers ( antigens), so they are universal acceptors of blood.

9. d. Human egg = 23 , Human sperm = 23 , Human zygote = 46

10. d. An egg with 24 chromosomes fertilized by a sperm with 23 chromosomes.

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