LIFE: THE SCIENCE OF BIOLOGY
LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 9781319145125
Author: Sadava
Publisher: MAC HIGHER
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Chapter 12.1, Problem 3R
Summary Introduction

To analyze:

The genotypes of the parents, based on the given data.

Given:

The number of progeny for each color, produced by a cross between the guinea pigs, having black and albino coat color, is presented in Table 1 as follows.

Table 1: Number of offsprings produced as a result of a cross between the black (B) and albino (b) coat color.

Serial number Phenotype of parent Number of black progeny Number of albino progeny Parental genotype
1 Black×Black 12 0
2 Albino×Albino 0 12
3 Black×Albino 5 7
4 Black×Black 9 3

Introduction:

The phenotype of an organism is the observable traits and genotype refers to the genetic makeup of the organism. The phenotypic traits of an organism are related to its genetic constitution directly. Mendel law of dominance indicates that the recessive allele cannot express itself in the presence of dominant allele. The recessive phenotype is expressed only when present in pure homozygous (bb) state.

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