Chapter 10 Patterns of Inheritance

Cystic fibrosis is a lung disease caused by a recessive allele “f.” If a healthy carrier (Ff ) and an affected individual ( ff ) have a child, what is the chance the child will be affected with the disease?

• 1/4

• 1/3

• 1/2

• 3/4

• 1

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Why is it impossible for one of the female gametes to have genotype rr ?

• In the parent plant, each germ cell only has one r allele.

• The female’s rr alleles separate during meiosis, as gametes are being produced.

• Because the r and the y are not inherited together.

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A male with genotype Qq Bb Dd is crossed with a female with genotype qq bb dd. What proportion of the offspring will be homozygous recessive for all three genes?

• 1/2

• 1/8

• 1/4

• 1/6

• 1/3

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Which would you expect to see the most of in offspring?

• ABd

• ABD

• Abd

• abd

• A and C

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Color vision is controlled by an X-linked gene, with color blindness being recessive to full color vision. If a colorblind mother and father with full color vision have a family, which would you predict?

• 75% of the boys will be colorblind.

• 50% of the boys and 50% of the girls will be colorblind.

• All the boys will be colorblind and none of the girls.

• 25% of the girls will be colorblind.

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