A genetic disorder caused by an autosomal, recessive allele is characterized by falling asleep in genetics lectures when the lectures begin at 8 a.m. It is also characterized by waking up as the lecture ends. The disease is known to be 60% penetrant. Complete expressivity occurs in only 40% of people that exhibit the disorder. Incomplete expression occurs only when the person falls asleep, but fails to wake up as the lecture ends. a. Must the percentages of penetrance and expressivity sum to 100%? Explain. b. What percentage of students who are homozygous for the recessive allele will both fall asleep at 8:00 a.m. and still be sleeping when the lecture ends? Show your work.

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