Monohybrid Inheritance and Genetic Diagrams

Explain why a boy cannot inherit haemophilia from his father.

A test cross using a different brown rabbit produced four offspring, all of which were brown. Explain why this indicates that the brown rabbit may be homozygous.

A test cross was carried out between a brown rabbit and a white rabbit. Five brown offspring and one white offspring were produced. Use a genetic diagram to show how this indicates that the brown rabbit must be heterozygous.

Construct a genetic diagram to predict the ratio of phenotypes in the F₂ generation of a cross between a homozygous brown rabbit and a white rabbit.

Construct a genetic diagram to show that all of the offspring of a cross between a homozygous brown rabbit and a white rabbit are heterozygous brown rabbit.

A woman with blood group A and a man with blood group B have a child with blood group O. Use this information to determine the genotypes of the woman and the man, and then construct a genetic diagram to explain how the child inherited her blood group. Use the symbols I^A, I^B and I^O.

Construct a genetic diagram to predict the chance that a child born to two parents, both with blood group AB, will have blood group B. Use the symbols I^A and I^B to represent the alleles.