Marriages between close relatives and cousins are not advisable because

Choose the correct option for the offspring of a colorblind woman and a normal man.

Which of the following is not an autosomal dominant disorder?

$A$ woman with normal vision,but whose father was color-blind,marries a color-blind man. Suppose their fourth child is a boy. This boy will be ....... .

$A$ woman with normal vision marries a man with normal vision and gives birth to a color-blind son. Her husband dies,and she remarries a color-blind man. What is the probability of color blindness in her children from the second marriage?

In sickle-cell anaemia,which of the following amino acids is substituted?