In which of the following situations would sex selection not be ethically recommended?
(a) there is a history of duchenne muscular dystrophy in a family.
(b) the mother is a known carrier of haemophilia.
(c) the family already has five children of the same sex.
(d) the father is a haemophiliac.

3. in the fruit fly, recessive mutation brown, b, causes brown color of the eye and absence of red pigment. recessive mutation p of another independent gene causes purple color of the eye and absence of brown pigment. the cross of a brown-eyed female and purple-eyed male produced wild type eyes. what will be the colors and their ratio in f2?