Question

The largest unit within which gene flow can readily occur is a

a. population c. genus.
b. species d. hybrid.

Answer 1

a. population

Step-by-step explanation:

Gene flow cannot occur in hybrids because 99.9% of the time hybrids offspring are not fertile.

At genus level is not possible either because a hybrid is a cross breed at the genus level (horse-donkey).

A population is a group of species of 1 kind. A population of donkeys.