tetrad segregation types

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For a bivalent containing the genes A and B on one homolog and a and b on the other, three patterns of chromatid segregation are possible: AB, AB, ab, ab (referred to as the parental ditype); AB, Ab, aB, ab, where two chromatids are recombinant (the tetratype); and Ab, Ab, aB, aB, where all chromatids are recombinant (the nonparental ditype).

Subjects: Genetics and Genomics.

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