HARD
AS and A Level
IMPORTANT
Earn 100
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 IA and IB to represent the alleles.
Important Questions on Inheritance
HARD
AS and A Level
IMPORTANT
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 IA, IB and IO.
HARD
AS and A Level
IMPORTANT
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.
HARD
AS and A Level
IMPORTANT
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.
HARD
AS and A Level
IMPORTANT
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.
HARD
AS and A Level
IMPORTANT
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.
HARD
AS and A Level
IMPORTANT
Explain why a boy cannot inherit haemophilia from his father.
HARD
AS and A Level
IMPORTANT
In a species of plant, the alleles for the tall stem is dominant to short. The two alleles for leaf colour, giving green or white in the homozygous condition are codominant, producing variegated leaves in the heterozygote.
A plant with tall stems and green leaves was crossed with a plant with short stems and variegated leaves. The offspring from this cross consisted of plants with tall stems and green leaves and plants with tall stems and variegated leaves with a ratio of 1 :1. Construct a genetic diagram to explain this cross.
HARD
AS and A Level
IMPORTANT
What ratio of phenotypes would you expect from the cross of a male Drosophila from the F1 generation discussed with a female with ebony body and aristapedia antennae if the genes for body colour and antennae shape were not linked- that is, they were on different chromosomes? Explain using a genetic diagram.
