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My black hereford pic
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<blockquote data-quote="Keren" data-source="post: 464750" data-attributes="member: 3195"><p>SL, it does work. But the dominance/recessive relationship is only one of many relationships that exist within and between genes. As Knersie (I think) said, the white face mustn't be controlled by a simple mendelian dominant/recessive relationship. Unfortunately I have not had enough experience in animal genetics to tell you exactly how the white face is passed along. </p><p></p><p>Black exists in a dominant/recessive relationship. Not all colours do. For example, red and white in shorthorns is a co-dominance relationship. Neither the red nor white allele is dominant or recessive. </p><p></p><p>When you join a red animal (RR) to a white animal (WW), you get</p><p></p><p>----| R | R |</p><p>-------------------</p><p> W | RW | RW | </p><p>-------------------</p><p> W | RW | RW |</p><p>------------------</p><p></p><p>all roan calves (RW).</p><p></p><p>When you join two roan animals (both RW)</p><p></p><p>-----| R | W |</p><p>---------------------</p><p> R | RR | RW |</p><p>---------------------</p><p> W | RW | WW |</p><p></p><p>you get 50% roan calves, 25% red calves and 25% white calves. </p><p></p><p>Google "Gregor Mendel" - you should come up with something regarding simple mendelian genetics. You might also be able to find something about more complex genetics.</p></blockquote><p></p>
[QUOTE="Keren, post: 464750, member: 3195"] SL, it does work. But the dominance/recessive relationship is only one of many relationships that exist within and between genes. As Knersie (I think) said, the white face mustn't be controlled by a simple mendelian dominant/recessive relationship. Unfortunately I have not had enough experience in animal genetics to tell you exactly how the white face is passed along. Black exists in a dominant/recessive relationship. Not all colours do. For example, red and white in shorthorns is a co-dominance relationship. Neither the red nor white allele is dominant or recessive. When you join a red animal (RR) to a white animal (WW), you get ----| R | R | ------------------- W | RW | RW | ------------------- W | RW | RW | ------------------ all roan calves (RW). When you join two roan animals (both RW) -----| R | W | --------------------- R | RR | RW | --------------------- W | RW | WW | you get 50% roan calves, 25% red calves and 25% white calves. Google "Gregor Mendel" - you should come up with something regarding simple mendelian genetics. You might also be able to find something about more complex genetics. [/QUOTE]
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