Answer:
A
Explanation:
The two genes are B and b are located in the same spot, therefore they are alleles or alternative forms of the same gene.
I think it's option four because as far as I know, red/green color blindness is an example of a recessive, sex-linked trait (encoded on the X chromosome), which results in much more men to suffer from it than women.
Hope that helps!
An increase in insulating atmospheric gasses (e.g. carbon dioxide)
A light-year is how astronomers measure distance in space, hope this helps ^^
