Question

In a cross between a colour-blind male (XᶜY) and a normal female (XᴺXᴺ), what will be the condition of all sons?

Options

• All sons become colour-blind

• All sons remain normal

• Sons show variable phenotypes

• All sons become carriers

Answer 1

When a colour-blind male (XᶜY) is crossed with a normal female (XᴺXᴺ), all sons receive the Y chromosome from their father and Xᴺ from their mother, resulting in XᴺY genotype. Therefore, all sons remain normal with normal colour vision.