Question

Complete the punnett square below of a cross between a carrier mother (a female who carries one copy of the recessive allele and so appears normal herself) and a non-hemophiliac father.

Answer 1

Hemophiliac is a genetic disorder that inherited by X-linked recessive pattern. A daughter needs 2 genes to become sick(or 1 gene to become carrier) and the sons need to get 1 defect genes from his mother. If Xh defected gene and X normal genes, the table would be:

                    Father(XY)
                       X          Y
Mother Xh    XhX      XhY    ------>XhX= carrier , XhY= sick 
(Xh X)   X      XX        XY      ------>healthy