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.
Important Questions on Inheritance
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.
Using the symbols G and g for the alleles for coat colour and D and d for the alleles for eye colour. A cross between the animals in the F1 generation (DdGg X DdGg) gives 9 : 3: 3 : 1 ratio. In the actual cross between the animals in the generation, the numbers of each phenotype obtained in the offspring were:
grey body, dark eyes - 54
grey body, pale eyes - 4
white body, dark eyes - 4
white body, pale eyes - 18
Use a chi-square test to determine whether the difference between these observed results is significant.
