Answer :
The largest unit within gene flow can readily occur is a species.
What is gene?
The term "gene" has numerous interpretations in biology. A fundamental component of heredity is the Mendelian gene, and a molecular gene is a DNA sequence of nucleotides that is translated into functional RNA. Genes that code for proteins and noncoding genes are the two different categories of molecular genes.
The fundamental physical and functional unit of heredity is a gene. DNA constitutes genes. Some genes serve as instructions for producing molecules known as proteins. Many genes, however, do not code for proteins. From a few hundred DNA bases to more than 2 million bases, human genes can range in size.
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