Gene DRMC3 I located on the human chromosome number 9. A recessive allele of gene DRMC3 (d) causes a human disorder that affects the liver. The other allele for gene DRMC3 (D) is dominant to d and does not cause any disease. A man with the genotype Dd has a son with a woman who has developed the liver disorder caused by allele d. What is the probability that their son develops the condition? 100%
75%
50%
25%