Index >> Sex Chromosomes and Sex linked Inheritance >> Sex Influenced Genes for Mahogany Spots in Cattle

Sex-Influenced Genes for Mahogany Spots in Cattle
In Ayrshire cattle, the basic coat colour is white with spots of either red or mahogany. If we let MM be the genotype for mahogany spots individuals of this genotype will breed true and all of the off springs will have mahogany spots. Furthermore, the genotype mm results in red spots and also breeds true. An interesting situation arises when a pure-line mahogany individual is crossed with a pure line red individual.
The results of this cross are suggesting that only the heterozygous genotype (Mm) is sex-influenced, with the males having mahogany spots and the females having red spots.