The plant can either have a dominant allele or a recessive allele what would be a reason that is not a hardy weinberg equilibrium

If the allele frequency keeps changing with generation to generation this means that genes have evolved and no Hardy Weinberg equilibrium takes place.

Explanation:

Conditions for Hardy Weinberg equilibrium which says that no genetic variation in a population would take place if certain factors do not interfere these are:

1) No mutation should take place.

2) No cross pollination in plants

3) Both the alleles i.e. dominant and recessive should have constant genotype for generation to generation.

4) No selective cross in the plants should take place.

The genotype frequency of the dominanat or recessive alleles can be calculated as:

The two alleles are A1 and A2

frequencies are p and q for dominant and recessive genotype

p+q = 1

If the allele frequency changes in the population this means that Hardy Weinberg equilibrium is not there.