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Unformatted text preview: student has a penny, nicked, a dime, and a quarter. She flips them all simultaneously and
checks for heads or tails. What is the probability that all four coins will come up heads? She
again flips all four coins. What is the probability that she will get four heads both times? What
probability rule did you use to determine your answers?
31. The first child of two normally pigmented parents has albinism, a recessive trait that results from
lack of the pigment melanin. Given that the normal allele is A and the albino allele is a, draw
this pedigree and label both phenotypes and genotypes. What is the probability that the second
child will be a carrier of the albino gene? Given that the second child is unaffected, what is the
probability that he or she is a carrier?
32. What is the probability that, if three identical coins were flipped, all would end up heads? What
is the probability that the three coins would not either be all heads or tails?
33. Phenylketonuria (PKU) is an inherited disease determined by a recessive allele. I...
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 Fall '12
 CherylannHollinger
 Genetics, Plants, AP Biology

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