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Part of a genetic counselor’s job may be discussing with parents the probability of their
child inheriting a recessive allele for genetic disease. The counselor may use a Punnett
square to illustrate the chances of a child inheriting this allele. What is this genetic
counselor illustrating when constructing a Punnett square to advise these parents?

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luisvaschetto

The Punnett square considers gamete combinations. These combinations will depend on parental alleles.

What is a Punnett square?

A Punnett square is a diagram used to estimate genotypic and phenotypic proportions in a given genetic cross.

The Punnett square has into account gamete combinations to estimate genetic proportions in a given cross.

For example, in presence of a recessive allele designed as 'a' in a parent

           A       a

A       AA     Aa

A       AA     Aa

Learn more about Punnett square here:

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