Hi again, I refer the sun newspaper April 27th 2011 page 27 an article called "Ewe been seeing somebody else?" Because on a smallholding near Royston Herts they have 37 white mums ( ewes) and all were mated to Rowley a white South African Dorper male sheep. But ALL the resulting 60 lambs were all black. So 100 pc black offspring ( from different mums too ).
I was taught in o level biology 35 years ago that " if the children show it and the parents dont then it is recessive". So I take it that black ( in sheep) is recessive which would explain why both white parents had black sheep BUT it does not explain the mendelian ratio at all. So I am very interested as to what is happening here.
First I would have thought black would dominate over white but then this story tells me that white is dominant over black but that both parents all carry the recessive black allele. Which seems okay for the one male Rowley but that all 37 white mums are also heterozygotes for this trait too seems over the odds? Hope I,m explaining well?
a Peter Morris of the Nat. sheep association blames a genetic throwback to a jet black gene in the dads ancestry but that would make this black gene dominant and therefore Rowley would show it in his phenotype would he not? Put me out of my misery please. Tks Eileen.