Different alleles of genes are called traits. For example hair color, eye color or blood type.
This set of instructions is called a gene.
Operon
A set of instructions for making a particular protein is called a gene. Genes are made up of DNA sequences that encode the specific sequence of amino acids that make up a protein. These instructions are transcribed from DNA to mRNA and then translated into a protein by ribosomes.
A heterozygote.
Some would say the gene but in reality it is the codon or triplet. This is the set of three genetic "letters" that specifies an amino acid or an instruction to the ribosome.
A piece of DNA which controls a trait is a gene variations of a gene are called alleles. If you mean "controls how much a particular trait is expressed" then you would be dealiung with the promoter region of a gene which is near the start and controls how strongly a gene is expressed.
The expression of a gene is called the phenotype.
It is called gene replication or gene duplication.
gene flow
It is which 2+2=4 got it this is very wrong!
A gene that can be masked by another gene is referred to as a recessive gene. This means that the trait associated with the recessive gene is expressed only when two copies of the gene are present.
Different versions of the same gene are called