SAT Biology Practice Test 6: Genetic Inheritance

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Question 3 questions

Time 2 minutes

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1. In fruit flies, brick-red eye color is dominant to a bright orange color called cinnabar. A fruit fly with heterozygous eye color geno-type is crossed with homozygous recessive fruit fly. What is the probability of inheritance for the cinnabar phenotype and the heterozygous genotype?

A. Cinnabar phenotype = 1.0; Heterozygous genotype = 0
B. Cinnabar phenotype = 0; Heterozygous genotype = 1.0
C. Cinnabar phenotype = 0.5; Heterozygous genotype = 0.5
D. Cinnabar phenotype = 0.25; Heterozygous genotype = 0.5
E. Cinnabar phenotype = 0.5; Heterozygous genotype = 0.75

2. A woman expresses an X-linked recessive disorder. Which of these conclusions can DEFINITELY be made about the woman's parents?

I. Her mother passed on an allele for the disorder.

II. Her father expresses the same disorder.

III. Her mother does not express the disorder.

A. I only
B. II only
C. I and II only
D. II and III only
E. I, II, and II

3. Which of these is an example of polygenic inheritance?

A. Epistasis
B. Dominance
C. Segregation
D. Pleiotropy
E. Independent assortment