2. In humans, fingerprint ridge count follows a polygenicinheritance pattern. The minimum number of ridges is 80 in malesand 70 in females. Each active allele will produce an additional 12ridges in males and 9 ridges in females. Active alleles arerepresented by uppercase letters.

• What is the fingerprint ridge count in a male having thefollowing genotype? o AABBccDd? __________ aabBccdd____________

• What is the fingerprint ridge count in a female having thefollowing genotype? o AABBCCDD?_________ aabbCcDD?____________

• What is the least number of active alleles a child born of thefollowing couple could inherit? Father: AABBccDD Mother: aabbCCdd •What is the probability that a child would have a genotype with theleast number of active alleles?

3. The gene for sickle cell anemia is recessive. Suppose a manand woman are both carriers.

• What is the probability that they will have a child withnormal blood cells?

• What is the probability that they will have a child who hassickle cell anemia?

• What is the probability that they will have a child who is acarrier?

4. A woman with type A- blood marries a man with type B+ blood.Is it possible for this couple to have a child with:

• Type O blood?

• Type AB blood?

• Type A blood?

• Type B blood?

5. Hair texture in humans is presumed to follow an incompletedominance inheritance pattern whereby genotype CC results in curlyhair, cc results in straight hair, and Cc results in wavy hair.Suppose a man with straight hair has children with a woman who haswavy hair. What is the probability that a child born to this couplewill have:

• Straight hair?

• Wavy hair?

• Curly hair?

6. The production of coat color in Labrador retrievers involvestwo sets of genes where one set is epistatic to the other. Supposethe gene for black (B) fur is dominant to brown (b) fur, and theproduction of coat pigment requires at least one copy of thedominant gene, E. Lack of coat pigment (ee) results in a yellowlab. A cross is made between two dogs with genotype, BbEe. Whichcolor dog would be most rare?

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