Look up Gregor Mendel and his pea plant experiments Why does P1 look all alike and F1 looks very different?
Mendal wanted the seed to produce not just by one parent so he joined two different kinds of plant to stop self-pollination. P1 was all alike beacuse it was the original pair of plants, not making it any different. The generation of the same plants didn't change.
F1 was the opposite which were also called "first filial" having different traits. Mendal also discovered the principle of dominance stating that some alleles are dominant and others are reccessive meaning the F1 plant has different forms of genes from its parents. The f1 plant produces two types of gametes, the allele for tallness or shortness.
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