Question

Albinism is due to a recessive gene. a. Give the results (the genotypes, phenotypes, and their...

Albinism is due to a recessive gene.

a. Give the results (the genotypes, phenotypes, and their respective frequencies) of a classic Mendelian cross between a mouse with albinism and another mouse homozygous for pigmented coat color. This is the F1 generation.

b. Give the results of a cross between 2 mice of the F1 generation: what are the expected phenotypic ratio and the expected genotypic ratio?

Homework Answers

Answer #1

Please find the answers below:

Answer a: According to the information, the cross is made between an albino (aa) and a normal (AA) mice. Thus, the Punnett square can be formulated as below:

a a
A Aa Aa
A Aa Aa

Genotye: All Aa

Phenotype: All normal colored

Frequency: 50% for allele A and 50% for allele a.

Answer b: According to the information, the cross has been made between two individuals of F1 generation i.e. Aa*aA. Thus, the Punnett square can be formulated as below:

A a
A AA Aa
a Aa aa

Genotype frequency: AA : Aa : aa :: 1:2:1

Phenotype frequency: Normal : albino : 3:1

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