Human genetics problems please help?

Question

1.)A klinefelter individual is color blind ( x-linked recessive disorder) Both his father and his mother have normal vision, but his maternal uncle is color blind. In which parent and at what meiotic division did sex chromosome non disjunction occur?

2.) A Turner patient had hemophilia (X-linked recessive disorder). Her mother does not have hemophilia, but her father does. In what parent did nondisjunction occur so that the single X came from the father?

Answer 1

2. Nondisjunction in the mother gave the Turner patient an egg with no X-chromosome.

Answer 2

1.) Klinefelter individuals have an extra sex chromosome - XXY. If both parents had normal vision, the mother must be a carrier (not color-blind, however she has the recessive allele on one of her X's). The non-disjunction occurred from the mother's chromosomes during anaphase of meiosis II.

2.) Turner - female with one X chromosome instead of two (XX). Nondisjunction occurred in the mother during anaphase of meiosis II.

Answer 3

1.) If his maternal uncle is colourblind, and his father isn't, then his defective X chromosome must have come from his mother.

2.) Turner syndrome girls have sex chromosomes XO, if she had inherited haemophilia from her father, it must have come from her paternal grandmother, as her paternal grandfather could only have passed a Y chromosome to his son ie the Turner's father.

Answer 4

i might choose the try. Everytime I had something that became a accessible new symptom, i may well be thinking, "it is it, I even have it". i think of the respond you will get would be diverse for each man or woman.