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Old 03-20-2011
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Genetics NBME 7, X linked disease lethal in utero

A carrier of X linked recessive disorder that is lethal in utero. Which of the following is expected ratio of her viable female to male child .
A) 1:1
B) 1:2
C) 2:1
D) 2:3
E) 3:2

please need your input.
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Old 03-20-2011
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Default C. 2:1

I'd choose 2:1

.....X.....Y
X...XX...XY
...⨰X....⨰Y⟶nonviable

Of the viable babies left in the grid, two are female and one is male...
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Amenah (03-20-2011), chulady (03-20-2011)
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Old 03-20-2011
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Quote:
Originally Posted by Mondoshawan View Post
I'd choose 2:1

.....X.....Y
X...XX...XY
...⨰X....⨰Y⟶nonviable

Of the viable babies left in the grid, two are female and one is male...

Thank you very much.
I did wrong on that question.
Could I further post for discussion of questions which I did not get ?
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Old 03-20-2011
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Quote:
Originally Posted by chulady View Post
Thank you very much.
I did wrong on that question.
Could I further post for discussion of questions which I did not get ?
Sure - I'm no super genetics expert, though; you might want to wait until some more people have weighed in to take my answer as right...
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