Multiple Choice Question. Looking for quick answer. Highschool/JC Biology
Category: Science > Biology
Asked by: operator-ga
List Price: $2.00
14 Jun 2004 14:14 PDT
Expires: 14 Jul 2004 14:14 PDT
Question ID: 361046
Dimples and freckles are both autosomal dominant phenotypes. If a man who is heterozygous for both these genes marries a woman who is heterozygous for dimples but homozygous recessive for freckles gene, then what is the probability that they will have a child with dimples and freckles? a. 1/16 b. 2/16 c. 3/16 d. 6/16 OR 3/8 e. 9/16
Re: Multiple Choice Question. Looking for quick answer. Highschool/JC Biology
Answered By: tox-ga on 14 Jun 2004 17:29 PDT
d. 6/16 or 3/8 Crossing two heterozygous individuals produces a dominant phenotype 3/4 of the time (a). Crossing a homozygous recessive with a heterozygous produces a dominant phenotype 2/4 or 1/2 of the time. Thus, to have both traits, simply multiply the two, 2/4 * 3/4 = 6/16. r R +------ r | rr rR a) R | rR RR = 3/4 r R +------ r | rr rR b) r | rr RR = 2/4 I hope this helps, don't forget to rate. Feel free to ask for clarification. Cheers, Tox-ga
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As the question may appear it looks like I am asking someone to do my homework for me but the truth is that these questions are from a test that I failed and I am now seeking other ways to better understand these concepts. I have tried to seek other help with my professor but she has not been responsive.
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