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Sex |
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SEX. The physical difference between male and female in animals.
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Beginning early in sex determination and gonadogenesis in fish, communication between nonadjacent tissues is necessary. Each captured crow was banded, aged by palate coloration (3), measured for sex determination by discriminant function analysis (4), and painted across the span of the tail feathers for identification. A) the authors write in their abstract `(1) sex determination is random, or (2) sex determination is facultative or biased', (B) the authors claim (1) there is evidence against Weinberg's Rule--that among human dizygotic (DZ) twin pairs, there are almost exactly equal numbers of same-sexed (SS) and opposite-sexed (OS) pairs--and that (2) this evidence constitutes grounds that support `the biased or facultative position' (their p. |
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