Concept:Continuous variation is polygenic, meaning it is controlled by many genes.
Explanation:Continuous variation is usually controlled by several genes, not by one or two pairs.
It can be influenced by environmental factors.
When plotted on a graph, it follows a normal distribution curve.
Being controlled by one or two pairs of genes describes discontinuous variation.
Therefore, that statement is not true about continuous variation.
Answer:D. is usually controlled by one or two pair(s) of genes