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Mendel and the Gene Idea (Mendel Developed a model to explain the 3:1…
Mendel and the Gene Idea
Mendel discovered the basic principles of heredity by breeding garden peas in carefully planned experiments
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To achieve cross-pollination of two plants, Mendel removed the immature stamens of a plant before they produced polled and then dusted pollen from another plant onto the altered flowers.
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Made sure that he started his experiments with varieties that, over many generation of self-pollination, had produced only the same variety as the parent plant.
Mendel allowed the F₁ plants to self-pollinate and planted their seeds, the white-flower trait reappeared in the F₂ generation.
Mendel used very large sample sizes and kept accurate records of his: 705 of the F₂ plants had purple flowers, and 224 had white flowers
Mendel reasoned that the heritable factor for white flowers did not disappear in the F₁ plants but was somehow hidden, or masked, when the purple-flower factor was present
Mendel’s terminology, purple flower is Dominant Trait, and white flower colors is Recessive trait.
F2 generation was evidence that the heritable factor causing white flowers had not been diluted or destroyed by coexisting with the purple-flower factor in the F1 hybrids.
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Mendel Developed a model to explain the 3:1 inheritance pattern he constantly observed among f2 offspring.
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For each character; an organism inherits two copies (that is two alleles) of a gene, one from each parent.
If two allele, determines the organism's appearance the other' the recessive allele, has no noticeable effect on the organism's appearance
the two alleles for a heritable character segregate (separate from each other) during gamete formation and end up in different gametes.