How genetic battles affect intraspecies reproduction

Animals compete on a genetic level over how much each parent contributes to raising young, write Constantino de Jesus Macias Garcia, director of the Ecology Institute at the National Autonomous University of Mexico, and Michael Ritchie, professor of evolutionary biology and speciation at Scotland’s University of St. Andrews. For example, males of some species pass along genes to their offspring that are modified to induce extra growth at the expense of the mother, but females counterbalance …

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