If a woman carries an Xlinked recessive lethal mutation what
If a woman carries an X-linked recessive lethal mutation, what proportion of her offspring will be males (what percent of the survivors) if she mates with a normal male?
Solution
Let the allele in question be \"A\" and \"a\".
Woman\'s genotype - XAXa
Man\'s genotype - XAY
So 1/3 proportion of her offspring will be males. That is 33% of the offspring will be males.
| XA | Xa | |
| XA | XAXA | XAXa | 
| Y | XAY (survivor male) | XaY (dead male) | 

