Abstract

In the mature oocyte C(1)-4 and Y-4 interchanges do not direct disjunction of the centromeres of the involved heterologs. C(1)-4 detachments are recovered in either sex and almost every time ( 13 14 ) with a free fourth chromosome that is the sister of the involved four. Y-4 fragments are recovered preferentially in males ( 28 28 ) and with a free, sister four ( 26 28 ). In the mature oocyte segregation patterns are determined and C(1)-4 and Y-4 interchange usually involve heterologs segragating to the same pole.

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