The maternal-effect mutation bicoid (bcd) is recessive. In the absence of the bicoid protein product, embryogenesis is not completed. Consider a cross between a female heterozygous for the bicoid alleles (bcd+ /bcd–) and a male homozygous for the mutation (bcd–/bcd–).
(a) How is it possible for a male homozygous for the mutation to exist?
(b) Predict the outcome (normal vs. failed embryogenesis) in the F1 and F2 generations of the cross described.
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