What type of sex chromosome will be contained by the sex cells of a female giraffe? x chromosome y chromosome x and y chromosomesegg cells do not contain sex chromosomes. of what is this an example? a child with a widow's peak has a mother who is homozygous dominant for a widow's peak and a father who is homozygous dominant for a widow's peak. homozygous dominant homozygous recessive heterozygous heterozygous recessive !