Imagine that your grandmother is homozygous for a mutant allele that encodes for
ID: 141489 • Letter: I
Question
Imagine that your grandmother is homozygous for a mutant allele that encodes for webbed toes. Your grandfather does not possess the allele. Your grandparents have four children, including your mother and her three brothers. Neither you, your mother, nor her brothers exhibit webbed toes. However, all of your cousins exhibit webbed toes. Given this information only, what phenomenon might best explain this phenotypic pattern in your family? O a- epistasis Ob.genomic imprinting Oc crossing over Od. X-linked inheritance Oe. It is impossible to choose any of the above without knowing the sex of each cousin.Explanation / Answer
Answer: Choice d
Reason: According to the information, the grandmother is homozygous in nature, but none of her kids is affected from the disease. However, an alternate generation exhibits this character in some of the offsprings. This is a typical feature of X-linked recessive pattern of inheritance where alternate generations demonstrate the phenotype.