What fraction of offspring of the cross AaBb AaBb would be homozygous for both the dominant alleles?

1/4 * 1/4 = 1/16 will be homozygous for both the dominant alleles.

Is AaBb dominant or recessive?

The individual with genotype recessive for both traits, i.e. aabb, has the same albino phenotype as the aaBB and aaBb individuals due to epistasis. The albino phenotype masks any phenotype that might be caused by the recessive homozygous, recessive bb genotype.

When AaBb and AaBb are crossed in F2 generation the ratio of AaBb will be?

Probability of AaBb in F2 generation= 4/16. Correct answer is D.

Can a person’s genotype be determined by their phenotype?

No, a person’s genotype cannot be determined solely by their phenotype as many genes in our genome do not get expressed.

What is recessive epistasis?

Recessive epistasis is the phenomena in which the expression of one gene pair is dependent on another gene pair (OpenStax College, 2013). In other words, one gene must be turned on for another gene to be expressed. Three phenotypes result from recessive epistasis in a 9:3:4 ratio (Miko, 2008).

Whats the purpose of a test cross?

A test cross is a way to explore the genotpye of an organism. Early use of the test cross was as an experimental mating test used to determine what alleles are present in the genotype.

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