Question

Hemophilia is a genetic disorder that causes a protein required for normal blood clotting to be missing.


In a cross with a mother who carries the allele for hemophilia and a father who has normal blood clotting what would be the genotypes of the parents?
A. XCXC, XCY
B. XCXc, XCY
C. XCXc, XcY
D. XCXC, XcY

Answer 1

Hi.


here is your answer.



If a carrier female ( XHXh ) marries with a male with normal clotting of blood (XHY) Then all daughter will have normal clotting of blood but half of them will be carriers for the disease.

Half the sons will be haemophilia while remaining will have normal clotting of. blood.


so here,

GENOTYPE OF THE PARENTS IS :-,

OPTION NO -

B. XCXc,XCY



PARENTS : CARRIER FEMALE × CARRIER MALE.

XCXc. × XCY


GAMETES : XC XC. XC. Y


F2. : XC XC. XCY. XCXc. XcY




Here,


XC XC = NORMAL FEMALE

XCY = NORMAL MALE


XCXc = Carrier female

XcY = haemophilia male.




hope it helps you ☺