SELECTIVE BREEDING GCSE Biology 9-1 | Combined Science (Revision & Qs)

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https://www.youtube.com/watch?v=kLTe8LmN7qU

Ringkasan

TLDRSelective breeding is a human-driven process to create plants and animals with particular genetic traits, such as disease resistance in crops or increased milk production in livestock. The procedure involves selecting parents with the desired traits, breeding them, and selecting offspring that display those traits for further breeding over generations. However, this practice can reduce genetic diversity and increase the risk of inherited diseases in certain breeds, exemplified by health issues in pugs. The video engages viewers with questions about the definition, examples, and ethical implications of selective breeding.

Takeaways

  • 👩‍🌾 Selective breeding manipulates natural selection to enhance specific traits.
  • 🐄 Key examples include disease-resistant crops and livestock that produce more milk.
  • 🐶 Domestic dogs are bred for gentle temperaments.
  • 🌸 Some flowers are bred for size and uniqueness to increase market value.
  • 🧬 The process involves selecting parents with desirable traits for breeding.
  • ⚠️ Selective breeding reduces genetic variation within species.
  • ❗ Inbreeding can lead to increased risk of genetic defects.
  • 🌟 Pugs exemplify health issues related to selective breeding.
  • 🤔 Ethical concerns arise from the potential for inherited diseases.
  • 📚 Questions prompt deeper reflection on selective breeding practices.

Garis waktu

  • 00:00:00 - 00:03:35

    Selective breeding, a process where humans breed plants and animals for desired characteristics, has been practiced for centuries. Examples include selecting crops resistant to diseases, breeding animals for increased meat or milk production, and domesticating dogs for gentle natures. The process involves selecting parent organisms that exhibit desirable traits, breeding them, and then selecting and breeding their offspring over multiple generations to reinforce these traits. However, selective breeding can lead to inbreeding, causing increased risks of diseases and genetic defects, as seen in certain dog breeds like pugs. Additionally, it reduces genetic variation as only individuals with the desired characteristics are allowed to breed. The ethical concern centers on the potential health defects caused in animals due to selective breeding.

Peta Pikiran

Video Tanya Jawab

  • What is selective breeding?

    Selective breeding is the process where humans breed plants and animals for specific desired characteristics.

  • What are some examples of selective breeding?

    Examples include: disease resistance in crops, animals that produce more meat or milk, and domestic dogs with gentle natures.

  • How does selective breeding affect genetic variation?

    It greatly reduces genetic variation as only individuals with desired characteristics are allowed to breed.

  • What are the ethical concerns associated with selective breeding?

    Selective breeding can lead to defects and an increased risk of diseases in certain animals.

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Gulir Otomatis:
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    humans have been manipulating natural
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    selection for many centuries they do
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    this in order to make animals that have
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    desirable characteristics like cars that
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    produce loads of milk this is called
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    selective breeding and that's what we're
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    learning about today selective breeding
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    is the process by which humans breed
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    animals and plants for particular
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    genetic characteristics there are four
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    examples in the specification to learn
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    first we've got disease resistance in
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    crops animals which produce more meat or
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    milk domestic dogs with gentle nature's
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    and large or unusual flowers that will
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    sell well the first cases of selective
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    breeding where thousands of years ago
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    when humans first bred food crops from
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    wild plants and these domesticated
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    animals to do selective breeding there
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    are a few stages first of all you must
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    select the parents that have the desired
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    characteristics for example maybe floppy
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    eared bunnies or more popular pets so
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    you would select two parents that have
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    floppy ears the second step is to them
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    freed them together they will produce
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    lots of offspring some of which will
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    have the floppy ears this is because
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    allele fur the characteristic is not
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    always passed on to every offspring just
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    some the third step is then to select
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    the offspring that do have the desired
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    characteristic ie the floppy ears and
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    then you breed them together you repeat
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    this for many generations and eventually
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    all of the offspring will have the
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    desired characteristic there are some
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    problems with selective breeding it can
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    lead to inbreeding this is when some
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    breeds have an increased risk of disease
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    or inheriting genetic defects for
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    example pugs are known to have an
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    increased risk of eye diseases and they
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    often have breathing problems okay pause
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    the video try these questions in your
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    head or on some scrap paper and press
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    play when you're ready to go
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    one define selective breeding and give
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    two examples from the spec this is a
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    process where humans breed plants and
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    animals for desired characteristics and
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    now you need to give two examples
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    so there are disease resistance in crops
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    increase meet our milk production dogs
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    with gentle natures and larger unusual
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    flowers - what is the impact of
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    selective breeding on genetic variation
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    in a population and why well it greatly
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    reduces genetic variation because and
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    this is the y part only individuals with
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    the desired characteristics are allowed
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    to breed and pass their alleles on all
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    the other alleles in the population will
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    eventually be lost 3 what is the main
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    ethical objection to selective breeding
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    well as you saw it can cause defects and
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    an increased risk of disease in some
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    animals hi DGD learn how humans have
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    further manipulated characteristics of
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    living things in the genetic engineering
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    video and if you're finding this useful
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    please subscribe thanks and bye
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    [Music]
Tags
  • Selective Breeding
  • Genetic Characteristics
  • Disease Resistance
  • Animal Breeding
  • Crop Production
  • Genetic Variation
  • Ethical Concerns
  • Inbreeding
  • Domestic Dogs
  • Breeding Process