Hemophilia is a X-linked recessive trait. I will denote it as XA for dominant and Xa for recessive.
Hemophilic male: Xa Y
Carrier female: XA Xa
Cross:
Xa Y
XA XaXA XAY
Xa XaXa XaY
Thus, as shown, of the ratio of two possible female offspring genotypes for Hemophilia, only 1/2 will have the disease; the chance is therefore 50%.
The ratio for male offspring genotypes for Hemophilia is 1/2 as well; the chance is therefore 50%.
Answer:
When meisosis occurs, a parent cell creates 4 gamete cells with 23 chromosomes in each.
Boys shoulders broaden and voice deepen, Girls start having menstrual periods and develop breast. <span />
0.25 km= 0.25 x 1000m = 250m = 250x100cm = 25,000cm