Traits controlled by genes can only be acted upon natural selection because they have to helpful to the survival of that organism.
Tracheae to distribute oxygen
Natural variation provided the phenotypes that natural selection then acted on, over time causing evolution
There is only two possible offspring.
Bb and bb
Homo is the same
Hetero is different
b b
B <u> Bb </u> <u> Bb</u>
b <u> bb </u> <u> bb </u>
Answer:
naturally living organisms
