Question

If a boy's father has haemophilia and his mother has one gene for haemophilia; what is the chance that the boy will inherit the disease [CPMT 1980, 2000; DPMT 1992; AIIMS 1999; Pb. PMT 1999]
A) 25%
B) 50%
C) 75%
D) 100%

Answer 1

D..............
hope it is right .and plz mark as brainliest

Answer 2

100℅
bcos see in above image ...
XX FOR BOY FATHER
XY FOR MOTHER BCOS Y CHROMOSOME IS FOR FEMALE..
BY CROSSING WE GET ABOVE 4 CHANCES IN WHICH TWO ARE XY SO NOT A BOY... TALKING ABOUT XX SO BOTH ARE RECCESIVE X CHROMOSOME SO 100 ℅ AFFECTED..

HOPE ITS TRUE. U MIGHT UNDERSTAND.. try to understand the image