One form of dwarfism, achondroplasia, is caused by a dominant allele (D). If two individuals with achondroplasia have children, there is a 1/4 chance one of their children will have the homozygous dominant genotype and will not survive the pregnancy. This fact tells you that this is a case of a _________ and the dwarf parents' genotypes must be both _________.

Question

a) lethal recessive allele; dd
b) lethal dominant allele; DD
c) lethal dominant allele; Dd
d) lethal recessive allele; Dd

Answer 1

Ans: c) lethal dominant allele; Dd