Question

a(n) select choice is defined as an alternative form of a single gene passed from generation to generation. select choice hybrid trait allele

Explanation:

To solve this, we recall the definitions: A "hybrid" is an offspring of two different species/breeds. A "trait" is a characteristic. An "allele" is an alternative form of a gene. The question defines it as an alternative form of a single gene passed down, so allele matches.

Answer:

allele