Answer:
The correct answer is : male : female = 1:2
Male percent = 33.33%
female percent = 66.66%
Explanation:
In this question, it is given that a lethal gene is carried by X chromosome which is recessive which means will cause death if both copies are recessive for this gene.
The cross between normal man and hybrid or heterozygous women
The gametes: XH and Y from man and XH and Xh from women where Xh is recessive letheal allele.
The cross:
     XH              Y
XH Â Â XHXH Â Â Â Â Â Â Â Â Â XHY
    normal female   Normal male
Xh   XHXh           XhY
   Carrier female    dead male
This explains that out of three offspring two will be females and one male. Thus the percentage will be:
Male : 1*100/3 Â = 33.33%
Female : 2*100/3 = 66.66%
