In cats, red and black genes are allelic and localized on the X = chromosome. They are transmitted independently, and therefore heterozygotes are mottled

In cats, red and black genes are allelic and localized on the X = chromosome. They are transmitted independently, and therefore heterozygotes are mottled. 1) How many different phenotypes can be obtained by crossing a tricolor cat with a black cat? 2) What is the probability (%) of the appearance of a tricolor cat?

Decision

X – black color

X ° – red color

X ° X – motley color

Genotypes of parents and offspring

1 motley cat: 1 black cat: 1 red cat: 1 black cat

R father

Xy

× mother

X ° X

Gametes X, Y X °, X
F1 X ° X motley, XX black, X ° Y red, XY black

Answer

1) 3
2) 0

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.