NAU Biology BIO 372
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BIO372 : Biol/Ecol Implications of Sex : Sex Determination : Review Questions

Sex Determination: Review Questions
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1. Many reptiles lack "sex chromosomes" and the sex of the individual is determined by the temperature at which the eggs are incubated.

a) Are the eggs in reptiles, as in birds, incubated by the parents? Explain.

b) What temperatures result in which sexes in turtles? in alligators?

2. David Crews provided evidence in his article of the "inadequacy of stereotypical divisions of male or female."

a) What does he mean by this statement?

b) What evidence did he provide for mammals and for leopard geckos to support his view?

3. Imprinting in mammals suggests that parthenogenesis is impossible in this group of organisms.

a) What is imprinting in the context of DNA expression?

b) What molecular mechanism is thought to "imprint" genes?

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