What does the constant c mean and what is it’s value

Constants are like a variable, except that their value never changes during execution once defined. ... Constants in C are the fixed values that are used in a program, and its value remains the same during the entire execution of the program. Constants are also called literals.

i guess because there isn't enough love going around. < 3

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.