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Variations on a Theme by Mendel A hypothetical human trait is controlled by a single gene. Four alleles of this gene have been identified: a, b, c, and d. Alleles a, b, and c are all codominant; allele d is recessive to all other alleles. a. How many phenotypes are possible? b. How many genotypes are possible?

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 3, Problem 35QP
Textbook Problem
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Variations on a Theme by Mendel

A hypothetical human trait is controlled by a single gene. Four alleles of this gene have been identified: a, b, c, and d. Alleles a, b, and c are all codominant; allele d is recessive to all other alleles.

  1. a. How many phenotypes are possible?
  2. b. How many genotypes are possible?

a.

Summary Introduction

To determine: The possible phenotypes for the co-dominant alleles a, b, c, and recessive allele d.

Introduction: The genotype is the genetic constitution of the organism whereas the phenotype refers to external characters visible in an organism. The alleles are the contrasting forms of a gene, and one of them is dominant, and the other is recessive.

Explanation of Solution

When two or more alleles are equally expressed themselves through the phenotype of the organism; the alleles are termed to be as co-dominant. The human blood group system is the best example of co-dominance.

The combination of the alleles ab, bc, and ac will not be the same, as the two alleles that will be e...

b.

Summary Introduction

To determine: The possible genotypes for the co-dominant alleles a, b, c, and recessive allele d.

Introduction: The dominant allele masks the expression of the recessive allele. Therefore, the dominant allele is expressed in homozygous and heterozygous genotypes whereas the recessive phenotype is only expressed under homozygous condition.

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Chapter 3 Solutions

Human Heredity: Principles and Issues (MindTap Course List)
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