1. Both a man and a woman are heterozygous for freckles. Freckles are dominant over no freckles. What is the chance that their child will have freckles?

2. Both a brother and a sister have attached earlobes, but their parents have unattached earlobes. Unattached earlobes (E) are dominant over attached earlobes (e). What are the genotypes of the parents?

3. A father has dimples, the mother does not have dimples, and all five of their children have dimples. Dimples (D) are dominant over no dimples (d). Give the probable genotypes of all persons concerned.

4. A woman is heterozygous for polydactyly (which is a dominant condition in which a person has more than the normal number of fingers and/or toes). The woman has a child with a man who is homozygous normal. What is the chance that their child will have more than ten fingers and/or toes?

5. John can’t curl his tongue – which is a recessive trait. Both of his parents can curl their tongues – which is dominant. Give the genotypes of all persons involved (use T and/or t in the genotypes).

6. A man has type AB blood and his child has type B blood. What are all of the possible blood types of the child’s mother? (Hint: think about the genotypes of blood types.)

7. A child who does not have dimples or freckles is born to a man who has dimples and freckles (both dominant) and a woman who does not. What are the genotypes of all persons concerned?

I just tried that link for the Baby Steps Through Punnett Squares site that I mentioned in my notes and it didn’t come up – so if you have tried it (it’s a great site, I think) and haven’t been able to get to it, please try typing in “Baby Steps Through Punnett Squares” in your search engine or try this site:

http://users.adelphia.net/~lubehawk/BioHELP!/psquare.htm

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