question archive Three closely related diploid species A, B and C each possessing two chromosomes per gamete are crossed to produce hybrids
Three closely related diploid species A, B and C each possessing two chromosomes per gamete are crossed to produce hybrids
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Three closely related diploid species A, B and C each possessing two chromosomes per gamete are crossed to produce hybrids. The order of the eight chromosomal regions, a, b, c, d, u, v, w, and x, are shown below for the gametes of each of these three species (• represents the centromere). Each chromosomal region is ten map units in length:
Gamete from Species A: • a b c d • u v w x
Gamete from Species B: • a c b d • u v w x
Gamete from Species C: • a b c w x • u v d
Question: Diagram meiosis in the B-C hybrid. Will the B-C hybrid have the same fertility as its parents? What are the effects on fertility, if any, of a crossover in the w-x region? Briefly explain your answer.
