Inheritance:
Human Patterns & Dilemmas
Study Questions

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  1. Hemophilia is a sex-linked recessive trait. A man with hemophilia marries a woman who is normal. What is the probability that their sons will have hemophilia?
  1. 0
  2. 25%
  3. 50%
  4. 75%
  5. 100%
  1. What percentage of the daughters of the above couple will be carriers?
  1. 0
  2. 25%
  3. 50%
  4. 75%
  5. 100%
  1. Which of the following is not an example of polygenic inheritance?
  1. human height
  2. intelligence
  3. sickle cell anemia
  4. skin color
  1. A man has a certain genetic disorder. Both his paternal grandmother and his father also had the same disorder. Is this an example of sex-linked recessive disorder?
  1. yes
  2. no
  1. The man in the previous question could have either an autosomal recessive or an autosomal dominant disorder.
TRUE
FALSE
  1. Klinefelter's syndrome is caused by nondisjunction of the X chromosome.
TRUE
FALSE
  1. A mother is Rh positive (heterozygous). The father is Rh negative. On the average, half of their children will be Rh negative.
TRUE
FALSE
  1. Non-disjunction can occur in anaphase I or anaphase II.
TRUE
FALSE
  1. Phenotype is dictated by both genetics and the environment.
TRUE
FALSE
MATCHING:
(use lower case; incorrect responses will be replaced with a "?".)

10. colorblindness a. XO

11. Rh factor b. Trisomy 21

12. Turner's syndrome c. sex-linked

13. Klinefelter's syndrome d. XXY

14. human height e. dominant/recessive

15. Down syndrome f. polygenic
B   R  I   G   H   A   M            Y   O   U   N   G       U   N   I   V   E   R   S   I    T   Y