Bicoid Is a Maternal Effect Gene That Is Essential for the Development

Multiple Choice

Bicoid is a maternal effect gene that is essential for the development of head structures in Drosophila. The F₁ generation from a cross of two phenotypically normal flies produces normal embryos, but in the F₂ cross, 25% of the embryos lack heads and die. What was the genotype of the mother in the P generation?

A) BB
B) Bb
C) bb
D) Either BB or Bb
E) Either Bb or bb