Continuous variation occurs when?
A. no real variation is apparent between forms.
B. variants come in distinct forms.
C. variants come in a smooth distribution from one extreme to another, such as on a bell curve.
D. only one extreme variant exists.

the answer is: reproductively

i think i spelled it wrong lol

anyways hope i

-lavira: )

the answer to the blank provided is “an autosomal gene that is required for the expression of genes on the x chromosome”.

testis-determining factor, abbreviated as td, which is more popularly known as sex-determining region y or sry protein, is a dna-binding protein or  gene-regulatory protein/transcription factor, encoded by the  sry gene. it is the gene responsible for the initiation of male gender determination in humans.