Campbell Biology (10th Edition)
Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 14, Problem 10TYU

To determine: Whether the curl allele is dominant or recessive in the first curl cat.

Summary Introduction

Concept introduction:

Genes have alternate forms known as alleles, which are transmitted to the offspring. If the offspring receives the same phenotypic traits of the parents, then it is known as true-breeding. If the two alleles are different, then there is a hybrid at F1 generation. The dominant allele out of the two alleles expresses itself and determines the phenotype. In F1 individuals, two different alleles segregate into gametes. During self-fertilization, the gametes unite randomly thereby having a chance for recessive allele to be expressed in the homozygous state at F2 generation.

Summary Introduction

To obtain: True-breeding curled ear cats and how to be sure that they are true-breeding.

Concept introduction:

Genes have alternate forms known as alleles, which are transmitted to the offspring. If the offspring receives the same phenotypic traits of the parents, then it is known as true-breeding. If the two alleles are different, then there is a hybrid at F1 generation. The dominant allele out of the two alleles expresses itself and determines the phenotype. In F1 individuals, two different alleles segregate into gametes. During self-fertilization, the gametes unite randomly thereby having a chance for recessive allele to be expressed in the homozygous state at F2 generation.

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As seen in the photo, Labradors come in three colors-- black, brown and yellow.  What is the genetic basis for these different coat colors?  One gene produces melanin, a pigment which is deposited in the dog's fur and makes the color dark.  With this gene, allele B (black) is dominant to allele b.  Only in the case of a recessive homozygote (bb) will the dog's phenotype be brown.  The regulatory gene is separate from the melanin gene but it acts as a switch, either turning the melanin gene on or turning it off.  Allele E is dominant and allows for the melanin to be deposited in the dog's fur ("on" switch), but if the switch gene is a recessive homozygote, the melanin is blocked ("off" switch) and a yellow dog is the result! 1. Two other Labradors mate and produce puppies. Their genotypes are Bbee and BbEe.  What color are each parent and what are the phenotypic rations of their offspring in the F1 Generation?  Show your work with a Punnett square.
Albinism is a recessive trait in humans . A geneticist studies a series of families in which both parents havenormal pigmentation and at least one child has albinism. The geneticist reasons that both parents in these families must be heterozygotes and that albinism should appear in 14 of their children. To his surprise, the geneticist finds that the frequency of albinism among the children of these families is significantly greater than 14. Can you think of an explanation for the higher-than-expected frequency of albinism among these families?
our sister breeds Labradors, but is unaware of the genetics of coat color, so she has been mixing and matching various breeding pairs, unable to predict the outcomes. She recently bred two black labs, expecting to get only black lab puppies, but instead, the litter included black, brown, and yellow pups. She is confused, but since you know your genetics, you can explain to her what’s going on. What are the genotypes of these two parents, for both of the genes involved? What are the possible genotypes of the various offspring? (Organize them by phenotype.) Litters of puppies are too small for reliable statistics, but if these two parents had a large number of puppies over time, what are the expected ratios (or fractions or percents) of the three possible coat colors?

Chapter 14 Solutions

Campbell Biology (10th Edition)

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