In X-linked inheritance, If Morgan crossed red-eyed males and red-eyed females (

Question

In X-linked inheritance, If Morgan crossed red-eyed males and red-eyed females (that are carriers), the ratio of red-eyed to white-eyed offspring would be?

a. 9:3:3:1                      c. 3:1

b. 1:1                           d. All red

Color-blindness is an X-linked recessive disorder. A color-blind man marries   a woman with normal vision but carrier what are the chances of having a color blind children?

a. 100%                       c. 50%

b. 75%                         d. 25%

Based on the question above, what are the chances of having children with normal vision ?

a. 100%                       c. 50%

b. 75%                         d. 25%

Explanation / Answer

Ans: b X-Linked inheritance, morgan crosssed red eyed males and red eyed females who are carriers, as males share Y chromosome to sons and X chromosome to daughters there will be a chance of 50% affected.the girl may be a carrier or affected and the boy is either affected or uneffected. Ans: c As it is a X-linked recessive disorder as father shares y chromosome to son and x chromosome to daughter, daughters may be carriers or affected. sons may be either affected or unaffected. Ans : d as the daughters are either carriers or affected, sons are either affected or unaffected.so the possibility of children with normal vision is 25%

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