If an apple tree fertilizes another tree of the exact same kind, why will the seed of one tree produce different tasting apples?
In: Biology
Background: Genes usually come in more than one form. The classic example (though somewhat inaccurate as we know now) is eye color. Blue and Brown. Brown is dominant and will show if the person has two copies of brown BB or one of each brown and blue Bb. Blue eyes are bb. Sometimes genes are not dominant or recessive. Think of a plant with a red and a white gene making a pink flower.
Back to the apple trees. Unless all the genes the twins (^^Ed or self fertile single tree) possess are all the exact same copy for every gene, the babies will end up with mixes that are not the same as the parents. If the parents are AA, bb, CC, dd for ALL genes, the kids would turn out the same. But the parents are more likely AA, Bb, Cc, DD or similar thus the kids could end up with BB or bb and CC or cc which the parents were not.
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