Question 1
Gray is homozygous while blue is a heterozygous form of a semi-lethal gene. Give the ratio of the offspring produced in the cross of two blues.
Question 2
HorsesIn horses, black coat color is influenced by the dominant allele (
B) and chestnut coat color by the recessive allele (
b). Trotting gait is due to a dominant gene (
T), pacing gait to the recessive allele (
t). Use this information to answer the following question(s).
In the horses example above, if a homozygous black trotter is crossed to a chestnut pacer,
| (a) | what will be the appearance of the F1 and F2 generations? |
| (b) | which phenotype will be the most common? |
| (c) | which genotype will be the most common? |
| (d) | which of the potential offspring will be certain to breed true? |
| |
A Black cat under the snow.
Horses require routine hoof care
Kazimir Malevich, Black Square.
A color-enhanced MRI image of the skull.