The Drosophila genes vg (vestigial wings) and cn (cinnabar eyes) are located at 67.0 and 57.0, respectively, on chromosome 2. A female from a homozygous strain of vestigial flies was crossed with a male from a homozygous strain of cinnabar flies. The F1 hybrids were phenotypically wild-type (long wings and dark red eyes).
(a) How many different kinds of gametes could the F1 females produce, and in what proportions?
(b) If these females are mated with cinnabar, vestigial males, what kinds of progeny would you expect, and in what proportions?