This was a bio passage about different species of lizards and their dewlap (large skin fold that reflects UV light) under the throat. According to the passage, male lizards have this.
Q. If the lizards have X-Y chromosomal sex determination, the locus of a gene for the UV reflectance pigment:
A. must be on the X chromosome
B. must be on the Y chromosome
C. must be on an autosome
D. Could be a sex chromosome or on an autosome
I chose B since male lizards have this dewlap, and Y chromosome is passed from a father to its male offspring. So I thought the gene would have be to on the Y chromosome only. But the answer is D. Could anyone tell me why it could be on either x or y chromosome and also can be on an autosome? Thanks in advance.
Q. If the lizards have X-Y chromosomal sex determination, the locus of a gene for the UV reflectance pigment:
A. must be on the X chromosome
B. must be on the Y chromosome
C. must be on an autosome
D. Could be a sex chromosome or on an autosome
I chose B since male lizards have this dewlap, and Y chromosome is passed from a father to its male offspring. So I thought the gene would have be to on the Y chromosome only. But the answer is D. Could anyone tell me why it could be on either x or y chromosome and also can be on an autosome? Thanks in advance.