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B2 - Genetics (Y7)
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What is complementary base pairing?
When A-T bond, and C-G bond
What does 'ethical' mean?
whether something is right or wrong
What did Darwin notice about the finches living on different Galapagos islands?
Their beak shapes had adapted different depending on the type of food sources available, this gave them the best chances of survival
What is natural selection?
Individuals with the advantageous characteristic survive & reproduce, this is passed onto the next generation (called 'survival of the fittest')
What is a disadvantage of genetic engineering?
Decreased biodiversity, diseases may adapt, unexpected/unknown damage to the environment
Name one adaptation of a polar bear to survive in a cold climate
Large round body size & small ears to reduce surface area/ white coat for camouflage/ large wide feet to prevent slipping/ thick layer of fat for insulation
What happens during fertilisation?
A sperm cell swims to meet an egg cell, the cells combine and divide to develop into an embryo
What did Rosalind Franklin do to help discover the structure of DNA?
She demonstrated the double helix structure using X-ray crystallography
What did Crick and Watson do to help discover the structure of DNA?
They built the 3D model of the double helix
Which letter base does 'G' form a pair with in double-stranded DNA?
 
C
 
A
 
T
Which letter base does 'T' form a pair with in double-stranded DNA?
 
A
 
C
 
G
What is the name of the strands of DNA that are found in the nuclei of cells?
Chromosomes
What is the name given to the overall structure of DNA?
Double helix
Why do we classify living things?
It helps us understand how living things are related to each other.
Is height an example of continuous or discontinuous variation?
Continuous - it is found over a range of values
Is body mass an example of genetic or environmental variation?
Both!
Is having a tattoo an example of genetic or environmental variation?
Environmental
Is eye colour an example of genetic or environmental variation?
Genetic
What does the word 'variation' mean?
The differences between individuals of the same species