The bison herd on Konza Prairie has begun to show a genetic defect. Some of the

Question

The bison herd on Konza Prairie has begun to show a genetic defect. Some of the males have a condition known as "rabbit hock" in which the knee of the back leg is malformed slightly. We do not yet know the genes controlling this trait but for the sake of our question, we shall assume it is a sex-linked gene and that it is recessive. Now, suppose that the herd bull (the dominant one which does most of the breeding) who is normal (XN) mates with a female cow that is a carrier for rabbit hock. What are his chances of producing a normal son? You must draw a Punnett Square and from that choose the correct answer from the possibilities: 0%, 25%, 50%, 100%

Explanation / Answer

The disease is sex linked recessive. It is X linked disorder as some of males has condition as well as females are also carrier.

Male is dominant (Let say X is carrier and XN is dominant normal)

xNY X XNX

XNX, XNXN, XNY, XY

XN

X

XN

XNXN

XNX

Y

XNY

XY

Probability of normal son(XY) = ¼ =m25%

XN

X

XN

XNXN

XNX

Y

XNY

XY

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