Sex determination in mammals

Linkage and crossing over. Vavilova 26, Moscow, , Russia.

The results applied across different species.

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Paint X 4 hybridized to chromosome X 4 and to Y 3 and the heterochromatic centromeric regions of chromosome 22 or 23 Figure 4h. If the female leaves the group often by dying , the breeding male will differentiate into a female and one of the previously non-breeding males will become the new breeding male.

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Conversely, mothers in poor condition would likely play it safe, producing more daughters, whose productivity is physiologically limited. However, the presence of a strongly hybridizing region on the larger echidna Y 3 using the platypus Y 5 paint suggests that the content of this platypus Y is incorporated into echidnaY 3.