B2 5.4 From Mendel to DNA

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What is Homozygous?
An individual with two identical alleles for a characteristic
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What is Heterozygous?
An individual with different alleles for a characteristic
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What is Dominant?
A characteristic that will show up in the offspring even if only one of the alleles is inherited
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What is Recessive?
A characteristic that will show up in the offspring if only both of the alleles are inherited
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What did Gregor Mendel realise from his work with peas?
That some characteristics were dominant over others and that they never mixed together
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Why did no one believe in Mendel's theories?
No one knew of genes or chromosomes at the time
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How did the invention of the microscope help prove Mendel was right?
People could see chromosomes through it
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What chemicals are DNA made from?
Bases
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What does the order of bases determine?
The order of amino acids in a protein
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How many bases are there for one amino acid?
3
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How can we identidy individuals using their DNA?
Through a process called DNA fingerprinting
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Card 2

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What is Heterozygous?

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An individual with different alleles for a characteristic

Card 3

Front

What is Dominant?

Back

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Card 4

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What is Recessive?

Back

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Card 5

Front

What did Gregor Mendel realise from his work with peas?

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