Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be always expressed in males (who are necessarily homozygous for the gene mutation because they have one X and one Y chromosome) and in females who are homozygous for the gene mutation. Females with one copy of the mutated gene are carriers. 50% probability of sons getting affected is there if mother is carrier.