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Question 1

Select one answer.

10 points

Traits that are sex-linked and recessive are ________________________.

more common in males

more common in females

equally common in both males and females

Question 2

Select one answer.

10 points

A gene that encodes an enzyme required for ribose synthesis is found on the X chromosome. Females that are heterozygous for the wild-type and defective mutant allele of this gene will show:

50% of their cells will lack enzymatic activity, the other 50% will be active.

50% of the enzyme activity in their cells, since one allele is inactive.

100% of the enzyme activity in their cells, since the X-chromosome with the inactive gene will be condensed.

None of their cells will have the enzyme activity since the chromosome with the inactive allele will cause the other X-chromosome to become condensed.

Question 3

Select one answer.

10 points

Sickle cell anemia is an autosomal recessive disorder. If two heterozygous individuals breed, what is the chance that their offspring will develop Sickle cell anemia?

100%

75%

50%

25%

Question 4

Select one answer.

10 points

Use the following information to answer the next two questions.

In humans, the condition for normal blood clotting (H) is dominant to hemophilia (h). Suppose William, who has hemophilia, and Linda, who is a carrier for hemophilia, have a son, Mark. What is the probability that Mark will have this condition?

100%

75%

50%

0%

Question 5

Select one answer.

10 points

If William and Linda have a daughter, what is the probability that she will have this condition?

100%

0%

75%

50%

Question 6

Select one answer.

10 points

What is the genotype of the unshaded individuals in the pedigree below?

aa

Aa

AA

Either AA or Aa

Question 7

Select one answer.

10 points

A genetic disorder that is sex-linked cannot also be ___________________.

all of these are possible

recessive

autosomal

dominant

Question 8

Select one answer.

10 points

Hemophilia is a recessive disorder and is on the X chromosome. Hemophilia is _____________________.

found more often in males than females

found more often in females than males

equally common in males and females

Question 9

Select one answer.

10 points

Nondisjunction in meiosis II results in: ______________________

Two cells with an additional chromosome and two healthy cells.

Two cells missing a chromosome and two cells with an additional chromosome.

Two cells missing a chromosome and two healthy cells.

One cell missing a chromosome, one cell with missing a chromosome and two healthy cells.

Please answer all questions

Explanation / Answer

The answers are as follows-

Q1. Males

Q2. None of their cells will have the enzyme activity since the chromosome with the inactive allele will cause the other X-chromosome to become condensed.

Q3. 50%

Q4.50%

Q5. 100%

Q6.Aa

Q7. autosomal

Q8. found more often in males than females

Q9. Two cells missing a chromosome and two cells with an additional chromosome.

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