Chapter 14

Last update by Shanal on 10/20/2013
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A man with type A blood marries a woman with type B blood. Their child has type O blood. What are the genotypes of these individuals? What other genotypes, and in what frequencies, would you expect in offspring from this marriage?

Man IAi; woman IBi; child ii. Other genotypes for children are 1/4 IAIB ,1/4 IAi, 1/4 IBi

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Related Quiz Content
• Answered in Chapter 14

Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. If a woman and her husband, who are both carriers, have three children, what is the probability of each of the following?

A) All three children are of normal phenotype.

B) One or more of the three children have the disease.

C) All three children have the disease.

D)At least one child is phenotypically normal.

A) 3/4 × 3/4 × 3/4 = 27/64

B) 1 - 27/64 = 37/64

C) 1/4 × 1/4 × 1/4 = 1/64

D) 1 - 1/64 = 63/64

• Answered in Chapter 14

The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these four genes, what are the probabilities that F2 offspring will have the following genotypes?

A) aabbccdd

B) AaBbCcDd

C) AABBCCDD

D) AaBBccDd

E) AaBBCCdd

A) 1/256

B) 1/16

C) 1/256

D) 1/64

E) 1/128

• Answered in Chapter 14

What is the probability that each of the following pairs of parents will produce the indicated offspring? (Assume independent assortment of all gene pairs.)

A) AABBCC × aabbcc → AaBbCc

B) AABbCc × AaBbCc → AAbbCC

C) AaBbCc × AaBbCc → AaBbCc

D) aaBbCC × AABbcc → AaBbCc

A) 1

B) 1/32

C) 1/8

D) 1/2

• Answered in Chapter 14

Karen and Steve each have a sibling with sickle-cell disease. Neither Karen nor Steve nor any of their parents have the disease, and none of them have been tested to reveal sickle-cell trait. Based on this incomplete information, calculate the probability that if this couple has a child, the child will have sickle-cell disease.

1/9
• Answered in Chapter 14

In 1981, a stray black cat with unusual rounded, curled-back ears was adopted by a family in California. Hundreds of descendants of the cat have since been born, and cat fanciers hope to develop the curl cat into a show breed. Suppose you owned the first curl cat and wanted to develop a true-breeding variety. How would you determine whether the curl allele is dominant or recessive? How would you obtain true-breeding curl cats? How could you be sure they are true-breeding?

Matings of the original mutant cat with true-breeding noncurl cats will produce both curl and noncurl F1 offspring if the curl allele is dominant, but only noncurl offspring if the curl allele is recessive. You would obtain some true-breeding offspring homozygous for the curl allele from matings between the F1 cats resulting from the original curl × noncurl crosses whether the curl trait is dominant or recessive. You know that cats are true-breeding when curl × curl matings produce only curl offspring. As it turns out, the allele that causes curled ears is dominant
Chapter 14
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