No explanation is given for this question. Let's discuss the answer together.
303.
Red-green colour blindness in humans is governed by a sex-linked recessive gene. A normal woman whose father was colour blind marries a colour blind man. What proportion of their daughters is expected to be colourblind?
No explanation is given for this question. Let's discuss the answer together.
306.
A cross between white eyed female and red eyed male Drosophila gives rise red eyed females and white eyed male. Rarely the cross gives rise to white eyed females and red eyed males. This is due to
A
Loss of one X-chromosome
B
Segregation of X- chromosome in female
C
Non disjunction of X- chromosome in female
D
Non disjunction of X- chromosome in male
Answer :
Non disjunction of X- chromosome in female