Chapter 9, Problem 10SQ

Summary Introduction

To explain: The fraction of the mice in the ${\text{F}}_2$ generation that are formed, when purebred brown mouse are bred with purebred white mouse and all the progeny in the ${\text{F}}_{\text{1}}$ generation are brown.

Introduction: The gene for the brown color (B) in mice is dominant over the white color (b) which is recessive. The cross of the purebred (homozygous) brown color species of mice with the purebred (homozygous) white color species of mice leads to the generation of all heterozygous mice with brown color in the ${\text{F}}_{\text{1}}$ generation. These heterozygous brown mice are mated in the ${\text{F}}_1$ generation to produce offspring in the ${\text{F}}_2$ generation. The progeny of mice generated in the ${\text{F}}_2$ generation will be homozygous dominant brown mice (BB), heterozygous dominant brown mice (Bb) and homozygous dominant white mice (bb).