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Select one answer. 10 points Genes on the X chromosome are called A. O epistatic B. sex-linked c. O somatic D. O autosomal Question 2 Hemophilia is a recessive disorder and is on the X chromosome. Hemophilia is Select one answer 10 points A. O found more often in males than females B. O found more often in females than males c. O equally common in males and females Question 3 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: A. О 100% of the enzyme activity in their cells, since the X-chromosome with the inactive gene will be condensed. B. O 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. c. O 50% of the enzyme activity in their cells, since one allele is inactive. D. O 50% of their cells will lack enzymatic activity, the other 50% will be active. 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? Select one answer. 10 points A. 100% B. O 75% C. O 50% D. O 25% Question 5 According to the pedigree below, this trait is Select one answer 10 points A. O Sex-linked dominant B. autosomal dominant c. O autosomal recessive D. O Sex-linked recessive Sickle cell anemia is an autosomal recessive disorder. A person with the disorder Select one answer. and a person that is a carrier mate. (A carrier has the allele for the trait but does not express it.) 10 points What is the chance that their offspring will develop sickle cell anemia? A. О 100% B. O 75% C. 50% D. O 25% Question 7 Select one answer Nondisjunction in meiosis I results in 10 points A. O one cell missing a chromosome, one cell with missing a chromosome and two healthy cells. B. O two cells missing a chromosome and two healthy cells. c. O two cells with an additional chromosome and two healthy cells D. O two cells missing a chromosome and two cells with an additional chromosome Question 8 What is the genotype of the shaded individuals in the following pedigree? Select one answer. 10 points Question 8 S What is the genotype of the shaded individuals in the following pedigree? A. AA B. aa С. ОАа D. O Either AA or Aa
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Biology Questions
1 –B
(X-linked.)
2-A
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