Answer to Question #150799 in Genetics for daniella

Question

Analyze the pedigree. Determine the type of inheritance of a character and give the genotypes of persons 1, 2, 3, 4 in the pedigree.

Answer 1

In an arbitrary pedigree in which both parents are heterozygous normal for a trait (Aa), the outcome of the generation II will be for instance, two boys and two girls; one heterozygous (Aa) normal boy, one homozygous (AA) normal boy, one heterozygous (Aa) normal girl and one homozygous (aa) affected girl hence the type of inheritance will be more of sex-linked.

Therefore, the probability of 1,2,3,4 would be as follows.

1 (AA) will be 1/4

2 (Aa) will be 1/2

3 (Aa) will be 1/2

4 (aa) will be 1/4