is roaning in horses dominant or recessive
For example in the case of a horse which has both a gene for roan R and a gene for grey G, both of which are dominant genes, you will not be able to tell that the horse has a roan gene because the greying covers it up.lso since your mare is also a roan Rr then 50% of time roaning will affect the colors. So a wierd but not impossible horse could be a red dun roan leopard appy which has a 50% chance of greying or not. P.S. a blanket pattern is also possible since your mare carries that as well.
Horses with the classic or true roan pattern may be any base color which is intermingled with unpigmented white hairs on the body. Except for white markings under the control of other genes, the head, mane, tail, and lower legs are dark. Roan is a simple dominant trait symbolized by the Rn allele.The University of California, Davis School of Veterinary Medicine 's genetics services have developed a DNA test that uses genetic markers to indirectly determine the number of Rn or rn alleles a horse has.oan is a coat color found in many animals, including horses, cattle and dogs.