M
miss black
Sv: Betäcka 2 skimmlar?
The WNT 1 or "W" gene is neither a dilution gene nor a graying gene. It is a dominant gene, and thus statistically, a heterozygous white horse (Ww) bred to a horse of any other color will produce white offspring 50% of the time. Further, all "true" white horses are heterozygous for the color. This means that they have only one copy of the gene (Ww). A Ww horse will appear white, because the white (W) allele "dominates" the non-white (w) allele.
The W gene has been mapped to the equine KIT gene and may be produced in different horse breeds by different mutations on assorted exons. The roan, sabino-1 (SB1, which may also produce entirely white horses, but by a different genetic pathway), and tobiano genes also trace to the KIT gene, but in independent regions and DNA tests can distinguish between these colors.[6]
If a horse has two white genes (homozygous white or WW), it is generally considered a lethal gene and the ensuing foal will die in the womb.[7] It is not known at present why this happens, but the end result is that there are no true albinos in the horse world.
Because the chance of breeding a live white foal is the same (50% probability) whether a white horse is bred to a white horse or to a colored horse, a breeder breeding for white coloration is advised to breed to a non-white horse to eliminate the risk of fatal homozygous white
The WNT 1 or "W" gene is neither a dilution gene nor a graying gene. It is a dominant gene, and thus statistically, a heterozygous white horse (Ww) bred to a horse of any other color will produce white offspring 50% of the time. Further, all "true" white horses are heterozygous for the color. This means that they have only one copy of the gene (Ww). A Ww horse will appear white, because the white (W) allele "dominates" the non-white (w) allele.
The W gene has been mapped to the equine KIT gene and may be produced in different horse breeds by different mutations on assorted exons. The roan, sabino-1 (SB1, which may also produce entirely white horses, but by a different genetic pathway), and tobiano genes also trace to the KIT gene, but in independent regions and DNA tests can distinguish between these colors.[6]
If a horse has two white genes (homozygous white or WW), it is generally considered a lethal gene and the ensuing foal will die in the womb.[7] It is not known at present why this happens, but the end result is that there are no true albinos in the horse world.
Because the chance of breeding a live white foal is the same (50% probability) whether a white horse is bred to a white horse or to a colored horse, a breeder breeding for white coloration is advised to breed to a non-white horse to eliminate the risk of fatal homozygous white
