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Genetics as it applies to evolution, molecular biology, and medical aspects.

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sona224
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Post by sona224 » Sat Oct 20, 2007 6:31 am

I have a homework question and needed a little help:
In Shorthorn cattle, both red coat color and white coat color are true breeding. Crosses of red X white produce progeny that are uniformly reddish brown but thickly sprinkled with white hairs; this type of coat color is called "roan". Crosses of roan X roan produce 1/4 red: 1/2 roan: 1/4 white. What kind of genetic hypothesis can explain these data?

I understand this question in the context of crosses:
1. Red Coat (RR) x White Coat (WW) = 100% Roan (RW)
2. Roan (RW) x Roan (RW) = 1 RR (Red), 1 WW (White), 2 RW (Roan)

But is there a specific hypothesis or certain name for this?

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mith
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Post by mith » Sat Oct 20, 2007 6:42 am

specify which type of dominance it falls under
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

sona224
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Post by sona224 » Mon Oct 22, 2007 12:58 am

ohhh! thanks so much--didn't really understand what they were asking for, but now i got it :)

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