HS-LS1-4

Use a model to illustrate the role of cellular division (mitosis) and differentiation in producing and maintaining complex organisms.

  1. Genetics

    Silencing genes — to understand them

    Hijacking a cell process called RNA interference can let scientists turn off a selected gene. Its silencing can point to what genes do when they’re on — and may lead to new treatments for disease.

    By Kathiann Kowalski
  2. Life

    Scientists Say: Parthenogenesis

    When a baby frog develops from an egg that’s never been fertilized, we call that parthenogenesis.

    By Bethany Brookshire
  3. Agriculture

    Explainer: What is a gene bank?

    Most banks store money. But some very special ones store deposits that may prove even more valuable: tissues that could prevent the extinction of breeds and species.

    By Kathiann Kowalski
  4. Genetics

    Newfound DNA ‘enhancer’ behind many natural blonds

    Some snippets of DNA other than genes play a role in giving some people of European a golden crown of hair.

    By Tina Hesman Saey
  5. Life

    Explainer: What is a stem cell?

    Special cells have ability to turn into several different types

    By Alison Pearce Stevens
  6. Science & Society

    Scientist profile: Leroy Hood

    The inventor of the DNA sequencing technique, and Albert Lasker Awardee, embarks on the next big challenge.

    By Lisa Grossman
  7. Genetics

    Animal clones: Double trouble?

    From agriculture to medicine to law, animal cloning to create genetic twins could change our lives.

    By Emily Sohn
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