Chapter 23, Problem 6AGP

Summary Introduction

To analyze:

The genotype of the children if one parent is homozygous recessive for attached earlobes and homozygous dominant for widow’s peak and other is homozygous dominant for unattached earlobes and homozygous recessive for the straight hairline.

Introduction:

An organism can be homozygous dominant if it has two copies same dominant alleles and homozygous recessive if it has two copies of same recessive alleles. In the given case the one of the parents has dominant alleles for widow’s peak and recessive alleles for attached earlobes. Another parent has dominant alleles for unattached earlobes and recessive alleles for the straight hairline.