You have 3 turtles, each with a mutation that causes them to have a polka dotted

Question

You have 3 turtles, each with a mutation that causes them to have a polka dotted pattern on their shells. You don't know if the mutations are in the same gene or in different genes. Assume that all 3 mutations are homozygous recessive. You perform three crosses. Cross 1: Turtle 1 X Turtle 2 rightarrow normal shells Cross 2: Turtle 1 X Turtle 3 rightarrow normal shells Cross 3: Turtle 2 X turtle 3 rightarrow polka dotted shells How many genes are likely to be causing the polka dotted pattern? Which crosses complemented? A) 1 gene, cross 3 complemented B) 2 genes, cross 3 complemented C) 1 gene, crosses 1 and 2 complemented D) 2 genes, crosses 1 and 2 complemented E) 3 genes, crosses 1 and 2 complemented In humans, thalassemia shows incomplete dominance: heterozygotes exhibit a mild form of the disease (thalassemia minor) and homozygotes show a much more severe form (thalassemia major). The inheritance of the ABO blood group exhibits both complete dominance (alleles A and B are both dominant to O) and codominance (A and B). A couple both have thalassemia minor. The husband has blood type A, and his mother was blood-type The wife has blood-type B and is heterozygous. What is the probability that they will have a child with thalassemia major and blood-type O?: A) 0 B) 1/16 C) 1/8 D) 1/4 E) 1/2

Explanation / Answer

9. D) 2 genes. Crosses 1 and 2 complemented

10. The probability that they will have a child with thalassemia major and blood-type O is B. 1/16

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