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Identical copies or varied young

Age 13 · Biology

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A strawberry plant sends out runners that grow into new plants identical to the parent, with no partner needed. Rabbits need two parents, and their young each get a different mix of traits, so a population gains variety.

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In the picture

  1. Parent strawberry plant: the single source of the new plants
  2. Plantlet on a runner: an identical copy of the parent
  3. Adult rabbit: one of two parents that each pass on traits
  4. Black young rabbit: one of the varied young, with its own mix of traits
  5. Tan spotted young rabbit: a different mix from its siblings and parents

Examples

  • Strawberry runners, potato tubers and cuttings from a plant give identical copies.
  • Rabbits, dogs and people have young that differ from their siblings.

Key takeaways

  • Asexual reproduction needs one parent and makes identical offspring.
  • Sexual reproduction mixes traits from two parents, creating variety that lets populations change over time.

Quiz: Identical copies or varied young (Age 13)

  1. A new strawberry plantlet grows on a runner. How many parents does it need, and how does it compare with its parent?

    • Two parents; it is a mix of both
    • One parent; it is an identical copy
    • One parent; it is a slightly different version

  2. Rabbit parents have several young. How do the young compare with each other?

    • Each gets its own different mix of traits
    • They are all identical copies of one parent
    • They are identical to each other but different from both parents

  3. Why is the variety created by sexual reproduction useful for a population over time?

    • It lets the population change over time
    • It means no partner is needed to reproduce
    • It keeps every generation exactly the same

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