Assume hairy knee cap (hk) is autosomal and recessive. Drawout the pedigree and

Question

Assume hairy knee cap (hk) is autosomal and recessive. Drawout the pedigree and give the probability that a couple will have afirst child with hairy kneecaps. A women has a sister with hairy kneecaps. Neither she nor therest of her family have hairy kneecap. The man has normal kneecaps,one grandparent has hairy kneecaps. Thank you!!!!!!!!!! Assume hairy knee cap (hk) is autosomal and recessive. Drawout the pedigree and give the probability that a couple will have afirst child with hairy kneecaps. A women has a sister with hairy kneecaps. Neither she nor therest of her family have hairy kneecap. The man has normal kneecaps,one grandparent has hairy kneecaps. Thank you!!!!!!!!!!

Explanation / Answer

Dominant genes are the ones that will prevail(or be expressed) if paired with a recessive gene.
Think of it this way in a table, say looking at hairy kneecaps= brown   and blue ==non hairy kneecaps
Gene of each Results in
Father Mother Child
Dominant Domintant Dominant
Brown Brown Brown
--------------------------------------…
Dominant Recessive Dominant
Brown Blue Brown
--------------------------------------…
Recessive Dominant Dominant
Blue Brown Brown
--------------------------------------…
Recessive Recessive Recessive
Blue Blue Blue

In this example it is important to note that both theFather and Mother may have Brown =hairy knee caps but it is thegenes they are passing along we are talking about. A recessiveattribute will only be expressed when both Father and Mother passthe recessive gene along to the child. I hope that helps some

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