roosevelt.blackboard.com 11. A cattle farmer has noticed his herd has begun to s

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roosevelt.blackboard.com 11. A cattle farmer has noticed his herd has begun to show a genetic defect where some of the males have a condition known as "rabbit hock" in which the knee of the back leg is malformed slightly. The genes controlling this trait are unknown but it is assumed to be a sex-linked gene that it is also recessive. Suppose that the herd bull (the dominant male which does most of the breeding) who is normal (XY) mates with a cow that is a carrier for rabbit hock (XXR). What are his chances of producing a normal son (1.0 pts)?

Explanation / Answer

XXR x Xy

25% of chance of producing a normal son.

XR Xr        XR XRXR (uneffected female) XR Xr (carrier female)        y XRy (uneffected male) Xr y (effected male)

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