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Chapter 14: Q14-10TYU. (page 293)

In 1981, a stray black cat with unusual rounded, curled-black ears was adopted by a family in California. Hundreds of descendants of the cat have since been born, and cat fanciers hope to develop a true鈥揵reeding 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?

Short Answer

Expert verified

The curl allele is a dominant condition confirmed by crossing the stray cat with curled feature with the non-curled cat.

True breeding curl cat is obtained by the breeding of the curled cat with another curled cat.

True breeding is confirmed by crossing the homozygous individual with the heterozygous individual.

Step by step solution

01

Determination of dominant or recessive condition in the curl allele 

The mating of the stray cat with the non curled cat proves that the curled ear is the dominant feature in some of the rings. The non curled cats are the offspring produced in the recessive condition.

02

True breeding curl cats

True breeding is the breeding in which the same type of offspring is produced.

The crossing of curled cats with another curled cat results in the true-breeding condition. True breeding forms the offspring with curled features.

03

Confirmation of true breeding condition

Curl cat is homozygous recessive in the case of the trait with the recessive condition. Homozygous traits have two copies of a single allele.

In the case of the dominant condition, the test cross is carried with the heterozygous individual with the homozygous recessive trait.

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Most popular questions from this chapter

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脳aabbcc鈫�AaBbCc

(b) AABbCc脳AaBbCc鈫�AAbbCC

(c)AaBbCc脳AaBbCc鈫�AaBbCc

(d) aaBbCC脳AABbcc鈫�AaBbCc

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 three individuals? What genotypes, and in what frequencies would you expect in future offspring from this marriage?

A rooster with gray feathers and a hen of the same phenotype produce 15 gray, 6 black, and 8 white chicks. What is the simplest explanation for the inheritance of these colors in chickens? What phenotypes would you expect in the offspring of a cross between a gray rooster and a black hen?

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 see if they carry the sickle-cell allele. Based on this incomplete information, calculate the probability that if this couple has a child, the child will have sickle-cell disease.

A histogram is a bar graph that shows the distribution of numeric data (here, the number of dark-skin alleles). To make a histogram of the allele distribution, put skin color (as the number of dark-skin alleles) along the x-axis and predicted number of offspring (out of 64) with each phenotype on the y-axis. There are no gaps in these allele data, so draw the bars next to each other with no space in between.
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