B) The figure below shows a pedigree for a rare trait in humans. Affected indivi

Question

B) The figure below shows a pedigree for a rare trait in humans. Affected individuals are indicated by the filled-in symbols. The woman II-2 is pregnant, with II-3 being the father. Her unborn child is represented by the"?". Q1.ls the trait inherited as a dominant trait or as a recessive trait? What is the best evidence for your answer? (6) Q2. What is the probability that both II.2 and 11.3 are heterozygous for the trait? (6) Q3. What is the overall probability that the child will be unaffected by the trait and be a girl? (6) 4 4

Explanation / Answer

Q1. It is inherited as recessive trust. Because, individual I-1 and I-2 although are normal but one of their offsprings II-1 is affected suggesting that both the parents I-1 and I-2 are hererozygous for the triat.

Q2: probability that individual II-1 will be heterozygous is 50% and probability that individual II-3 will be heterozygous is 100%

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