Which cross will produce only heterozygous offspring?Aa × aaAA × AaAa × AaAA × aa

The cross that will produce only heterozygous offspring is AA × aa.

Here's the step by step explanation:

1. AA represents a homozygous dominant individual, meaning both alleles for a particular trait are the same and dominant (A).

2. aa represents a homozygous recessive individual, meaning both alleles for a particular trait are the same and recessive (a).

3. When these two individuals cross, the only possible combination for the offspring is Aa, which is heterozygous (meaning the two alleles for a particular trait are different).

So, all offspring from this cross will be heterozygous (Aa).