question archive Jill has light eyes and her husband Jack has dark eyes

Jill has light eyes and her husband Jack has dark eyes

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Jill has light eyes and her husband Jack has dark eyes. All of their ten children have dark eyes. What is Jack's genotype?

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Jack's genotype is homozygous dominant.

It can be written as BB

Step-by-step explanation

A homozygous dominant genotype is one in which both alleles are dominant.

An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.

If the test cross results in only phenotypically dominant offsprings, then the parent organism is homozygous dominant for the allele in question.