Determine the genotype of the roan parents and explain how the presence of these alleles in the genotype?

Question

A novice dairy farmer wishes to establish a premium herd of distinctive roan shorthorn cattle. (Roan refers to the colour of the cattle’s coat: a mix of red and white.) Unfortunately the farmer’s knowledge of the inheritance of coat colour in this breed of cattle is rather shaky. After buying a number of roan shorthorn cows and having them artificially inseminated with s***n from a prize roan coloured shorthorn bull he is dismayed when the cattle give birth to calves of which only around half of the offspring are the desired roan colour, the remainder are either red or white in colour.

The farmer’s difficulties arise from the fact that in this breed of cattle there are three potential coat colours resulting from the various combinations of two different alleles. Coat colour is determined by alleles for white coat colour and alleles for red coat colour. The presence of red and white alleles in one individual’s genotype results in roan coloured coat.

Determine the genotype of the roan parents and explain how the presence of these alleles in the genotype contribute to the phenotype.

Answer 1

Um..... r u retarted for asking THAT Q. But those 2 guests WERE rite

Answer 2

The coat colours red and white are co-dominant and both will be expressed in the phenotype when both are present  - if he got himself some pure-breeding red and some pure-breeding white and crossed them, he would get all roan if he likes them so much.