Question 1
If an X-linked disorder is lethal to the affected individual prior to the age at which one reaches reproductive maturation, the lethality will be expressed only in males. Why is this so?Question 2
Below is a pedigree of a fairly common human hereditary trait in which the boxes represent males and the circles represent females. Shading symbolizes the abnormal phenotype.Answer 1
Heterozygous females who are "carriers" and do not express the disorder are the only source of the lethal allele in the population.Answer 2
(a) autosomal recessive