Answer to Question #155760 in Genetics for Virat

Question

A woman with black eyes marries a black-eyed man. One blue-eyed child was born from this marriage.

Questions:

1) Determine the genotypes and phenotypes of all family members and the likelihood of having a blue-eyed baby. Describe the type of inheritance?

2) What Mendel's law is observed in this case? Why?

3) Give 5 examples of human diseases with this type of inheritance.

Answer 1

1. Father - BB

Mother - Bb

Offsprings - BB, Bb, bB and bb

2. The Law of Segregation,since the two alleles of a pair (BB, Bb) segregated during gamete formation such that a gamete i.e BB receives only one of the two factors.

3.a) Down Syndrome

b) Cystic fibrosis

c) Alpha- and Beta-thalassemias

d) Sickle cell anemia

e) Marfan syndrome,