Question

Imagine that James (who is right-handed) and Kate (who is left-handed) have two children: Nate (left-handed)...

Imagine that James (who is right-handed) and Kate (who is left-handed) have two children: Nate (left-handed) and Nora (right-handed). We know that right-handedness is dominant over left-handedness, and that this gene follows Mendellian laws. Determine the genotype for each of the four family members, and then explain how you know.

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Answer #1

right-handedness is dominant over left-handedness

let the alleles be R- right-handedness, r- left-handedness

James is right-handed and  Kate left-handed they have 2 children Nate and Nora, Nate is left-handed and Nora is right-handed.

Since they have left-handed progeny James is heterozygous, If he was homozygous dominant, then all of his gametes will carry R allele and all of his progeny would have right-handedness.

so James is Rr, Kate is rr, Nora is Rr and Nate is rr

Rr * rr

R r
r Rr ( right-handed) rr ( left handed)
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