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Why are some genes dominant and some genes recessive?

from The Washington Post

In the 19th century, Austrian monk Gregor Mendel famously crossbred pea plants to show how traits, such as height, flower color, seed color and shape could be determined by parentage. He found that two parents with one trait could produce offspring that exhibited another — two tall plants would have mostly tall offspring, for example, but a percentage of their descendants might turn out short. more

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