AP BIOLOGY

Detailed explanation-1: -If she now marries a normal man then there will be 50% chances of her sons being colourblind. Since the son will receive the X chromosome from the mother and the Y chromosome from the father and one of the X chromosomes in the mother is normal and the other diseased.

Detailed explanation-2: -When a colour blind woman marries a normal visioned male, daughters will be carrier for this disease and all sons will be colour blind, this can be represented as follows: So, the correct answer is ‘All sons are colour blind, daughters carriers’.

Detailed explanation-3: -Final answer: A normal-visioned woman whose father was color-blind marries a color-blind man. Their fourth son may be color blind or may be of normal vision.

Detailed explanation-4: -Answer and Explanation: There is zero probability that the female offspring between a male with normal vision (XEY X E Y )and a colorblind female (XeXe X e X e ) will be colorblind.

Detailed explanation-5: -Complete answer: When a cross between a color-blind man and a woman with normal sight who has no family history of color blindness is done then the progeny will have four children – two daughters and two sons.