Many modern people have some Neanderthal DNAin their genome, but the Neanderthal alleles are notuniformly distributed across their genome. A person ofEuropean or Asian ancestry typically has 1.5 to 2 percent Neanderthal DNA in their autosomes. However, researchers have never found any Neanderthal alleles on the Y chromosome of a modern human. By one hypothesis, Neanderthal Y alleles disappeared because theywere incompatible with H. sapiens genes. Explain howreduced fitness in hybrids arising from genetic incompatibility could have, over time, led to the elimination of theNeanderthal Y alleles from the H. sapiens gene pool.

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Q: Explain how, by genetic drift, a certain version of the human Y chromosome might become extinct.

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Human Evolution

Human evolution is the process of evolution of humans from early man to anatomically modern humans. The process of evolution in humans leads to the gradual development of traits like bipedalism. Humans are the highly social animals that make them the most advanced animal on Earth.  Human evolution is an outcome of interaction among the following processes: