Biology for IGCSE & O level - Variation And Selection (Section 3 - No. 5)

What is the main difference between continuous and discontinuous variation?

Continuous variation is caused by genes only; discontinuous variation is caused by environmental factors only.

Continuous variation is due to genes and environmental factors; discontinuous variation is due to genes only.

Continuous variation is caused by genes only; discontinuous variation is due to genes and environmental factors.

Continuous variation is due to genes and environmental factors; discontinuous variation is due to environmental factors only.

Continuous variation results from the combined effects of genes and the environment, while discontinuous variation is determined primarily by genes.