Apply concepts of statistics and probability to explain the variation and distribution of expressed traits in a population.

  1. Genetics

    DNA: Our ancient ancestors had lots more

    Ancestral humans and their extinct relatives had much more DNA than do people today, a new study finds. It mapped genetic differences over time among 125 different human groups.

  2. Microbes

    The bugs within us

    Hordes of bacteria live inside people and other animals. This ‘microbiome’ can affect the development of the blood-brain barrier, food choices — even mating.

  3. Animals

    When a species can’t stand the heat

    When temperatures rise, New Zealand’s tuatara produce more males. With global warming, that could leave the ancient reptile species with too few females to avoid going extinct.

  4. Brain

    Why boys face higher autism risk

    Boys develop autism at four times the rate seen in girls. Girls’ genes are better protected from the mutations linked to this brain disorder, data now suggest.

  5. Life

    Caught in the act

    Scientists observe some evolutionary speed demons as they adapt over the course of just a few years to new environmental conditions.

  6. Animals

    Churk: Not for Thanksgiving

    Here’s what happens when livestock breeders cross a chicken and a turkey