Question

Albinism is a genetic disorder where an individual is homozygous recessive for the gene producing melanin (the “M” gene). Jack and Jill are both heterozygous at the “M” locus.

A) What is the probability of them having two albino boys OR two albino girls in a row (consecutively)? Show your calculation

One of their albino children (Sarah) meets a nice non-albino man (Sam) and has children of her own. Both of their children are non-albinos.

B) Can you determine the genotype of the father (Sam)? Explain

Answer 1

Genotype of Sam -
Sam is non albino and possible genotypes are -
MM (homozygous dominant) or
Mm (heterozygous).
• All children of sarah and sam are nonalbino, it is possible when sam produce more or all gametes with M allele.
• Both genotypes of Sam are possible - MM and Mm , but MM genotype has more probability and Mm has less probability.