1. A dramatic departure from expected phenotypic ratios may be the result of A.

Question

1. A dramatic departure from expected phenotypic ratios may be the result of
A. environmental influences.
B. linkage.
C. epistasis.
D. gene interactions.
E. All of the above

2. A woman of blood group A has a child with a man of blood group B. The child's blood is type O. What are the genotypes of the parents?
A. Mother: IAIA; father: IBIa
B. Mother: IAiO; father: IBIb
C. Mother: IAiO; father: IBiO
D. Mother: IAiB; father: IBIO
E. It is impossible for these individuals to have a child with type O blood.

3. In sex-linked inheritance of a recessive gene, all
A. male offspring of a normal male and a heterozygous female carrier would show the trait.
B. female offspring would be carriers.
C. male offspring who receive the mutant X chromosome would show the trait.
D. female offspring who receive the mutant X would show the trait.
E. Both b and c

Explanation / Answer

1. A dramatic departure from expected phenotypic ratios may be the result of
A. environmental influences.
B. linkage.
C. epistasis.
D. gene interactions.
E. All of the above

2. A woman of blood group A has a child with a man of blood group B. The child's blood is type O. What are the genotypes of the parents?
A. Mother: IAIA; father: IBIa
B. Mother: IAiO; father: IBIb
C. Mother: IAiO; father: IBiO
D. Mother: IAiB; father: IBIO
E. It is impossible for these individuals to have a child with type O blood.

3. In sex-linked inheritance of a recessive gene, all
A. male offspring of a normal male and a heterozygous female carrier would show the trait.
B. female offspring would be carriers.
C. male offspring who receive the mutant X chromosome would show the trait.
D. female offspring who receive the mutant X would show the trait.
E. Both b and c

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