Which of Mendel's generations was allowed to self-pollinate?
O Fi generation
OP generation
O Fi generation and F2 generation
O P generation and F2 generation

genetic variation will increase because of a new habitat and food source.

explanation:

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.