Mendel's peas

Mendel's peas

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Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Mendel's peas. Historical artwork of the peas (Pisum sp.) used by Gregor Mendel (1822-1884) in his experiments into heredity. He cross-bred peas that produced yellow (A) and green (B) peas. This produces a generation in which the peas are yellow (C). This is because the colour of the peas is controlled by an allele in which yellow colour is dominant. An allele is a pair of genes that have different effects on the same characteristic, for instance controlling pea colour. By breeding the C generation peas together, Mendel found that the next generation had a mixture of pea colours (D). The ratio of yellow to green peas was 3:1. His work formed the basis of genetic theory.

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Keywords: 19th century, 2nd, artwork, breeding, characteristic, colour, colours, evolutionary biology, experiment, genetic, genetics, gregor, heredity, historical, history, illustration, independent assortment, inheritance, inherited, mendel, nineteenth, pea, peas, phenotype, pisum sp., plant, pod, pods, portraits, second law, selection, selective, surname m, vegetable, vertical

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