Mendel concluded that the alternative forms of each trait are coded by <em>discrete factors</em>, which were called alleles that combine in pairs to express the trait. <em>Traits are inherited in discrete units and are not the result of "blending." </em>
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After making many crosses that involved different traits -such as<em> plant height, or flower colors</em>-, Mendel observed that, per trait, the F1 only expressed one of the alternative forms, while de other one disappeared.
Mendel named <em>dominant</em> the expressed variant.
Mendel then let these new plants auto pollinate and observed the results in the second generation, F2.
He saw that the variants that had previously disappeared among the F1, reappeared again. Both alternatives for each trait were present in the F2.
Mendel named <em>recessive</em> the second alternative variant.
Mendel explained his results by arguing that discrete factors were responsible for these phenotypes.
- These factors should have been present in the F1 in pairs.
- One of them came from one parental plant, and the other factor came from the other plant.
- These factors separated again during sex cells formation, producing two types of gametes, each with only one factor.
Mendel conclusion about his experiments was that per trait -flower color of plant length-, each plant had a pair of factors -which he named <em>alleles</em>-, and that each factor coded for one of the alternative forms of the traits -white or purple, tall or short-.
He thought that alleles separate -<em>segregate</em>- during the process of gamete formation.
The<u> </u><em><u>First Mendel's Law</u></em> is the first conclusion he took about his experiments and is known as the <u><em>segregation principle</em></u>.
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Related link: brainly.com/question/9991795?referrer=searchResults
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