Why can't certain species reproduce with each other (ie. an elk and a moose)?

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Question

My students would like to know why certain species can't reproduce with each other (ie. an elk and a moose)?

Answer

Only species that are closely related on a genetic level can reproduce. During meiosis, a chromosome from each parent will need to come together to form a pair. If the chromosomes are too different they cannot come together and therefore not reproduce.

Answered By: Dr. Gijs Van Rooijen

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