INHERITANCE AND SELECTION

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Name the adaptations of a sperm cell.
Head contains chemicals, which break open the egg's membrane. Streamlined shape, helps it move quickly. Nucleus contains information to control the baby's new cells.
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Name the adaptations of a egg cell.
Nucleus contains information to control the baby's new cells. Large size contains food for the new baby. Hard outer membrane to ensure only one sperm fertilizes it.
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Why do we get identical twins?
When the egg and sperm fuse together the cells divide into 2 separate groups creating 2 embryos.
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Why do identical twins look similar?
Because they share the same DNA from the sperm and egg.
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How could identical twins change so they don't look so similar?
Through environmental factors, for example, hair dye.
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Why do we get non-identical twins?
The mother in one monthly cycle will produce 2 eggs where she would normally only produce one.This means 2 sperm must fertilize each egg, 2 embryos.
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Why do they not look similar?
Because they don't share the exact same DNA from the exact same egg and sperm, although some maybe similar.
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What the difference in inherited and environmental factors?
Inherited comes from you mum or dad so in your DNA but environmental comes from what you can change in your life.
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What is artificial selection?
This is where 2 organisms are chosen for each other because they have desirable traits.
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Give an example of inherited variation.
Height, eye color.
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Give an example of environmental variation.
Piercings, tattoos.
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Give an example of something which could be both inherited or environmental variation.
Skin color, hair color, weight.
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How many chromosomes do we have?
46.
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What is a gene?
Structures in the nucleus that carry information about one specific factor.
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What is a clone?
An organism with the same DNA.
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What is genetic engineering?
Where you can modify an organism on purpose.
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What is DNA?
Your individual genetic information.
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Other cards in this set

Card 2

Front

Name the adaptations of a egg cell.

Back

Nucleus contains information to control the baby's new cells. Large size contains food for the new baby. Hard outer membrane to ensure only one sperm fertilizes it.

Card 3

Front

Why do we get identical twins?

Back

Preview of the front of card 3

Card 4

Front

Why do identical twins look similar?

Back

Preview of the front of card 4

Card 5

Front

How could identical twins change so they don't look so similar?

Back

Preview of the front of card 5
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