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<blockquote data-quote="regolith" data-source="post: 665025" data-attributes="member: 9267"><p>Dun, traits like colour blindness in humans are hosted on the XY chromosomes. It's a recessive trait, so if the mother passes on an X carrying the recessive and the father has the non-colourblind dominant trait his daughters won't be colourblind (but will be carriers). The boys will be colourblind because they have no matching gene to mask the recessive trait.</p><p>Scurs in Angus crosses seem to work in a similar way - the female passes on the trait but only the males express it (unless the father also has the recessive on the X he passes on, in which case the daughters).</p><p></p><p>eb: I don't think it's that simple. Harking back to high school biology now... but during division traits can cross over between the pairs, so some carried on the Y could in theory end up on the split-off X.</p></blockquote><p></p>
[QUOTE="regolith, post: 665025, member: 9267"] Dun, traits like colour blindness in humans are hosted on the XY chromosomes. It's a recessive trait, so if the mother passes on an X carrying the recessive and the father has the non-colourblind dominant trait his daughters won't be colourblind (but will be carriers). The boys will be colourblind because they have no matching gene to mask the recessive trait. Scurs in Angus crosses seem to work in a similar way - the female passes on the trait but only the males express it (unless the father also has the recessive on the X he passes on, in which case the daughters). eb: I don't think it's that simple. Harking back to high school biology now... but during division traits can cross over between the pairs, so some carried on the Y could in theory end up on the split-off X. [/QUOTE]
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