Question

Having an extra finger is a dominant condition. a woman is homozygous dominant for an extra finger and her husband is homozygous recessive. what phenotypes do the offspring have and in what proportions

Answer 1

Answer:100% offspring has extra finger

Let say that the dominant gene for extra finger is F and the recessive gene if f. That means the parent genetic would be:
Mother: homozygous dominant = FF
Possible allele: 100% F

Father: homozygous recessive= ff
Possible allele: 100% f

Since the father has 100% chance to give f allele and the mother has 100% of giving F allele, then the offspring would be:
100% Ff (heterozygous). Since the extra finger condition is dominant, a heterozygous individual will express the extra finger condition.