In a cross between a white-eyed female with two X chromosomes and one Y chromoso
ID: 277087 • Letter: I
Question
In a cross between a white-eyed female with two X chromosomes and one Y chromosome (XwXwY) with a red-eyed male, the majority of the males have white eyes and the majority of the females have red eyes. However, rare red-eyed males and white-eyed females are present as well. What is the most likely chromosomal constitution of the red-eyed males and white-eyed females resulting from this cross?
Notes: Xw is recessive (white) and X+ is dominant (red). The answer is not A or D. I'm thinking it's C or E but I'm not sure.
Also, I am not just looking for the answer but I am also looking for an explanation! Specifically, how do we pair off chromosomes if the female has 3 (2 X and a Y).
A. X+XwY males and Xw femalesExplanation / Answer
Correct answer will be C. Since X+ is dominant and only passed to daughter and not to son and most female are red eye phenotype but Xw is recessive and most male are white eyed.