B3g New Genes For Old Answer

B3g New Genes For Old Answer Sheet

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  • Created by: Amira
  • Created on: 02-05-12 09:17
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B3g New Genes for Old
1. There is a fish that lives in arctic area that has natural resistance to frost. Some
scientists transferred the gene that makes the fish frost resistant to tomatoes.
What is transferring genes from one organism to another called?
Cloning / genetic engineering / genetic variation / mutation / phototropism
2. Scientists can further improve these frost resistant tomatoes by selective
breeding. Suggest two other features that they may want to improve:
Disease resistance
Speed of growth
Colour or size
3. Selective breeding involves these steps:
Animals or plants with the desirable characteristics are chosen first
They are allowed to breed in plants the pollen is transferred to the
female part of a flower. (stigma)
From the offspring the ones with the desirable characteristics are chosen
again and allowed to reproduce. (Higher: the offspring are selected from
different families to prevent an accumulation of any harmful genes, such
as a genetic disorder)
This process is repeated over and over again until a new breed with
desirable characteristics is obtained.
4. Owen also grows apples to sell.
His apples are large and taste sweet.
However, there are not many apples on each tree.
There are some wild apples growing near his farm.
The wild apples are small and taste sour.
Each wild apple tree produces lots of apples.
Owen thinks that if he breeds his apple trees with the wild apple trees he will only
get apple
trees that produce lots of large, sweet apples.
Will he only get apple trees that produce lots of large, sweet apples?
Explain your answer.

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It is easy to clone plants but not animals. This is because animal cells usually lose
the ability to differentiate, but many plant cells retain this ability.…read more


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