Genetic disorder question

[virtualmaster999]

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Hey everyone!

I came up with a Genetics problem and wanted to see what the outcome would be for this one. Could someone help me out?

Suppose a male's genotype is either X'Y or XY, where X' is the disorder.
And that he mates with a female X'X

What is the probability that they will produce a female who is X'X? So there's two different test crosses, one with a 1/2 chance and the other with a 1/2 chance. So do you add these probabilities in this case?

Thanks in advance!

 

[adamrose]

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[adamrose]

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[DAT Destroyer]

Hey everyone!

I came up with a Genetics problem and wanted to see what the outcome would be for this one. Could someone help me out?

Suppose a male's genotype is either X'Y or XY, where X' is the disorder.
And that he mates with a female X'X

What is the probability that they will produce a female who is X'X? So there's two different test crosses, one with a 1/2 chance and the other with a 1/2 chance. So do you add these probabilities in this case?

Thanks in advance!

The probability will be 1/4. Just a simple punnet square will tell you that X'X has 1/4 of a chance being produced.

 

[virtualmaster999]

Do you have to multiply in this case, or did you see that there are 8 possible genotypes, but only 2/8 (1/4) will be X'Y? I made two punnet squares, one with each male genotype, and not sure if I just add up the genotypes.

 

[510586]

Aren't both squares 1/4? How did you get 1/2 in one of the squares?

 

[virtualmaster999]

Aren't both squares 1/4? How did you get 1/2 in one of the squares?

Yeah disregard my last reply, I was counting all offspring rather than just females. 1/4 for each square.