X-linked recessive
Biology
Level
2
A child affected by a rare genetic disease is born to two healthy parents. The child has a healthy sister. If the disease is sex linked recessive, what is the probability of the sister being a carrier. (Put answer in form of decimals).
The answer is 0.5.
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1 solution
In this case, the mother is a carrier and the father is healthy. Hence the sister inherits an unaffected X chromosome from the father and has a 2 1 chance of inheriting the affected chromosome from the mother. Hence the answer in decimals is 0.5