Question

eye colour in the fruit fly is said to be sex linked. This simply means that the gene for eye colour is:
(a)On the Y chromosome
(b)On an autosome
(c)On the X and Y chromosome
(d)On the X chromosome

the answer is given optionA but I think that it should be optionC

am I thinking right?

Answer 1

Hey friend. Option D is right since the allele of sex linked traits is either on the X or Y chromosome and in this case it is Y chromosome.
For a fly The eye color has to be either red or white. The red coloured eye is dominant.
The gene would be located in X chromosome as this is an x-linked trait.