What led to scientists accepting mendels ideas?

Basically his experiments, which scientists came to know only after he was dead.  His experiments, and of course, the result of this experiments that served as a proof of what Mendel afirmed, where one of the most importnat factors that made his ideas accepted.

They where also accepted because he discovered DNA, the basic laws of inheritance and chromossomes.

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The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11