topic 4

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  • Created by: bertie321
  • Created on: 10-06-21 18:12
what does natural selection mean?
survival of the fittest
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reason for natural selection?
genic variation, competition for resources, better adapting to selection pressure
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what things provide evidence for evolution?
fossils, bacteria and tools
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how do fossils provide evidence for evolution?
it shows how species how developed overtime as the characteristics may be different now than what the fossil show
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how does bacteria provide evidence for evolution?
Bacteria can evolve quickly because they reproduce at a fast rate. Mutations of bacteria produce new strains. Some bacteria might become resistant to certain antibiotics , such as penicillin, and cannot be destroyed by the antibiotic.
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what two fossils showed what human ancestors looked like?
Ardi and Lucy
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how do tools show evidence for evolution?
because it shows how the first tools where just stone the second generation of tools were stone crafted into complex shapes so it will dig better and then flint tools where used and shaped flit tools show evolution as they need better tools to survive
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what are the five kingdoms?
animals, plants Fungi, prokaryotic and protists
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what is selective breeding?
is when humans breed plants and animals for particular genetic characteristics.
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why is selective breeding useful?
can make new varieties that are economically important, by producing more or better quality food.
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disadvantages of selective breeding include:
reduced genetic variation can lead to attack by specific insects or disease and rare disease genes can be unknowingly selected as part of a positive trait, leading to problems with specific organisms,
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what is genetic engineering?
It involves modifying the genome of an organism by introducing a gene from another organism to result in a desired characteristic.
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advantages of genetic engineering?
More nutritious food,Tastier food, disease and drought-resistant plants that require fewer environmental resources , less use of pesticides,
increased supply of food with reduced cost and longer shelf life and faster growing plants and animals.
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disadvantages of genetic engineering?
The nutritional value of foods can be less, pathogens adapt to the new genetic profiles, there can be negative side effects that are unexpected, the amount of diversity developed can be less favorable
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how does genetic engineering work?
It works by physically removing a gene from one organism and inserting it into another, giving it the ability to express the trait encoded by that gene.
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Card 2

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reason for natural selection?

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genic variation, competition for resources, better adapting to selection pressure

Card 3

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what things provide evidence for evolution?

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Card 4

Front

how do fossils provide evidence for evolution?

Back

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Card 5

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how does bacteria provide evidence for evolution?

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