Question

1. A pedigree chart is a visual representation of the frequency and appearance of phenotypes of a particular gene. The figure below shows a pedigree chart for red-green colorblindness in a human family. The disorder is sex-linked recessive (Xb). Since the genes for the and green color receptors are located on the X chromosome, males are more likely to be affected than females.Typically, each individual in a pedigree chart is assigned a number. The genotype for Individual 1 is XbY, and the genotype for Individual 4 is XBXb, the genotype for Individual 24 is XbXb.According to the information provided, what is the genotype of the unknown individual number 25? XbXbXbY XXXBY

Answer 1

According to the information provided, the genotype of the unknown individual number 25 is XbY. As his father has passed him the allele Y and the mother only has the allele Xb.