Why do we have 3 different types of muscle instead of just one type?

Explanation:

Because each type of muscle controls a different part of the body. We have too many different things that need to be controlled to just have one type of muscle.

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.