If the inheritance type in the following pedigree is X-linked recessive, what is III-1’s genotype? If the inheritance type in the following pedigree is X-linked recessive, what is III-1\'s genotype? hemizygous for dominant allele Definitely heterozygous hemizygous for recessive allele Definitely homozygous dominant Solution Answer; Since III-1 is Hemizygous for dominant allele Explanation: Since III-1 is not affected he must be XY (where X carry dominant allele) II-3 is an affected male XcY II-4 is a carrier female XcX = XcXc, XcX, XcY, XY Since III-1 is not affected he must be XY Hemizygous for dominant allele.