He could then contribute the recessive f to his daughter. Even if Dad does breathe fire, they can produce a non-firebreather because Mom carries the F allele. Therefore, he can contribute the necessary a and b. The color genes are found on the X chromosome, one of the sex chromosomes. Females have only one X chromosome and males have two.
Males have two X chromosomes.
Therefore they have two sets of color alleles that can be expressed in many more ways. Once again the lethal allele, this time the double lethal, does them in.