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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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microggc microggc
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11 years ago
Dad has attached earlobes and mom is heterozygous for unattached earlobes, what phenotypes and genotypes can i expect from the offspring?
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#1
11 years ago
I'm going to call the alleles U for Unattached and u for attached.

Since we know mother is heterozygous for unattached, we can assume that she is Uu.  Since she actually has unattached, we can verify that unattached is dominant over attached.  Dad is attached, and since attached is recessive, he has to be uu.

Mom = Uu
Dad = uu

If you throw those two into a punnet square, you come out with
...   U    u
u Uu  uu
u Uu  uu

Your genotypes are Uu and uu at a 1:1 ratio, and your phenotypes are attached and unattached at a 1:1 ratio.
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