Probability of offspring with certain traits

[cc609]

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So you know those questions that say something like "What is the probability that a female with sex linked disease with a husband with nothing at all will have a child with a disease....etcc"

When they ask probability either the SON or DAUGHTER having a disease....do I account for the 50% chance that it will be a daughter, or do I just count the % that the sons have it? So in the above example, all the sons will have the disease and the daughters will be a carrier of the disease. Would I say 100% as the answer because all the sons have it or 50% because I have to take into account that the child they have may be a daughter?

 

[DAT Destroyer]

So you know those questions that say something like "What is the probability that a female with sex linked disease with a husband with nothing at all will have a child with a disease....etcc"

When they ask probability either the SON or DAUGHTER having a disease....do I account for the 50% chance that it will be a daughter, or do I just count the % that the sons have it? So in the above example, all the sons will have the disease and the daughters will be a carrier of the disease. Would I say 100% as the answer because all the sons have it or 50% because I have to take into account that the child they have may be a daughter?

It is 50% because you must account for all offspring. You do not always produce males.

 

[KyoPhan]

The keyword in the question is "child", which accounts for both male/female. If they said "son" or "daughter", then you would use their specific probability.

 

[Klin0295]

If they ask what the probability of having a son or daughter with the disease: multiply by 50%

If they ask what the probability of having any child with the disease: do not multiply by 50%

If they ask what is the probability of their son having the disease: do not multiply by 50%