Scientific Amercian-60 second science
Link:www.scientificamerican.com/podcast/episode.cfm?id=a-little-yolk-for-boys-09-06-05
Title:A Little Yolk for Boys
When it comes to lizards sex, size does matter.
for at least one type of lizard, large eggs are likely to make girls while smaller eggs yeild boys.
for many animals, the sex of an individual is dictated solely by its chromosomes. 染色體 n.
the scientists had earlier found that the nest temperature can influence the sex of the lizard. hatchling.
cooler nests turn out more boys, no matterwhat their chromosomes say.
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