If the mother is homozygous recessive (mm) and the father is homozygous dominant (MM), the alleles will mix, making the offspring have the alleles Mm. 100% of the offspring are Mm, 0% are MM, and 0% are mm.
The type of gamete that determines the sex of the offspring in birds would be ZW ( the ovum) because in most avian species the Z chromosome is the larger chromosome. It contains most of the gender-linked genes for females meaning the females choose the gender.