Problem:

The autosomal mutation Antennapedia (Antp) in Drosophila causes the antennae to develop as if they were legs. It is dominant with respect to the visible phenotype (legs on the head), but is a recessive lethal, that is, flies that are homozygous for Antp never come out of the pupa.

Question: Given the crosses below, indicate the phenotypic ratio among surviving adult flies.

a) Antp^(+) Antp X Antp^(+) Antp

b) An antennapedia male and a normal female.

Please show your work.