The square above is based on the eye color of two parents. One of the parents has brown eyes and carries the recessive gene for green eyes (a). What is the probability that a biological child of these parents will have brown eyes?

Explanation

It is given that the recessive gene for green eyes is the allele ‘a,’ and that one parent has brown eyes while also carrying the recessive green eye allele. This means that the dominant gene (A) gives brown eyes. Inspection of the square shows that half of the children will have green eyes (aa), and half of the children will have brown eyes (Aa).

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