5. Hemophilia is caused by a recessive gene located on the X-chromosome. A husband and wife both have normal blood clotting. However, both of their fathers had hemophilia(3 marks).
a. What is the probability that their first child is a son with hemophilia?
b. What is the probability that their first child has normal blood clotting?
c. What is the probability that their first child is a carrier girl?
a. What is the probability that their first child is a son with hemophilia?
b. What is the probability that their first child has normal blood clotting?
c. What is the probability that their first child is a carrier girl?
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Mom: XXh
Dad: XY
a. XXh * XY = XX, XY, XhX, XhY
The probability that their son has hemophilia (XhY) is 1/4 or 25%
b. Normal clotting blood (XX or XY)= 1/2 or 50%
c. Carrier girl (XXh)= 1/4 or 25%
Dad: XY
a. XXh * XY = XX, XY, XhX, XhY
The probability that their son has hemophilia (XhY) is 1/4 or 25%
b. Normal clotting blood (XX or XY)= 1/2 or 50%
c. Carrier girl (XXh)= 1/4 or 25%