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SEX. The physical difference between male and female in animals.
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Roach were exposed as embryos from fertilization up to 300 days posthatch (dph; to include the period of gonadal sex differentiation) or as postspawning adult males, and including fish that had received previous estrogen exposure, for either 60 or 120 days when the annual event of germ cell proliferation occurs. Wrasses are unique in the sense that complete gonadal sex reversal can take place. The Texas researchers suggest that theparthenogenetic lizard and fly, with their different origins and needs for a "male' presence, uncouple the tight association between gonadal sex and behavioral sex. |
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