HS-LS1-4

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

More Stories in HS-LS1-4

  1. Science & Society

    Expert panel approves human gene editing

    Scientists have recently been reporting big advances in the ability to tweak the genes of living organisms, including people. But some question the ethics of doing that. A panel of experts now says such research can go ahead — with one major exception.

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  2. Health & Medicine

    New treatments may rally ex-president’s fight against cancer

    Former President Jimmy Carter has a potentially lethal type of skin cancer that has already spread to his liver and brain. Recent improvements in medicine may help him fight it.

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  3. 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.

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  4. Life

    Scientists Say: Parthenogenesis

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

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  5. 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.

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  6. 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.

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  7. Science & Society

    Scientist profile: Leroy Hood

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