Answer
See Explanation
Work Step by Step
Colour blindness
- is an example of X-linked recessive trait.
- is characterized by:
1- all males who carry the gene are affected.
2- females are affected only if they are homozygous.
3- males are much more affected than females.
4- no transmission from father to son.
(no male to male transmission).
- if the man is color- blind , so he is affected (XcY).
- if the women has normal vision , so, she is:
a- normal ( XX, normal gene).
or b- carrier (XcX, hetreozygous).
The women father was color blind
- affected, XcY.
- the daughter will inherit the defective gene from
father & will be heterozygous( XcX, carrier) but
phenotypically normal ( i.e her mother is normal).
