heterozygous.
If it is heterozygous then we must lock the
trait down before we can continue. This is done
through selective breeding. Let is look closely
at the parents for a moment.If both parents where MM we would not have
seen the variations in the population for this
trait. It is a locked down trait. We know that
this trait will always breed true in its
population without any variations.If one of the parents were MM and the other
Mm we would have ended up with a 50/50
population of both variations. But one is
clearly homozygous and the other is
heterozygous.(^) M M
M MM MM
M MM MM
(^) M m
M MM Mm
M MM Mm