The phenomenon in which genetically identical individuals can assume two or more distinct body forms, induced by differences in the environment, is called.

a compound light microscope is used to magnify objects in steps.  

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is it multiple choice?

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.