Biology - Variation and Inheritance

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Define the term 'species'
Members of the same species can be interbreed to produce fertile offspring.
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What does discrete variation mean?
Members of the same species show variation (slight difference) in their characteristics
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What is an example of discrete variation?
Tongue rolling, ear lobe shape, seed shape
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What does continuous variation?
These characteristics that are controlled by more than one gene. The measurements are by a controlled range of values between a minimum and a maximum
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What is an example of continuous variation?
Height, weight and hand span
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What is a gene?
A section of DNA that determines 1 characteristic (protein) eg eye colour
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What is an allele?
Different forms of a gene eg brown, blue, green, hazel and grey
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What is a genotype?
The combination of alleles you possess for a specific gene
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What is a phenotype?
The 'expressed' trait/characteristic - how it physically appears
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What does the term homozygous mean?
The person has two copies of the same allele (eg TT or tt)
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What does the term heterozygous mean?
The person has two different alleles for the gene (eg Tt)
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What does dominant mean?
The most common form of the gene, one copy is enough to express this form
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What does recessive mean?
The least common form of the gene? two copies are required to express this form
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What is parent generation?
The initial couple which is bred
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What is the F1 generation?
The offspring produced from the parents
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What is the F2 generation?
The offspring produced if the F1 generation interbreed
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Other cards in this set

Card 2

Front

What does discrete variation mean?

Back

Members of the same species show variation (slight difference) in their characteristics

Card 3

Front

What is an example of discrete variation?

Back

Preview of the front of card 3

Card 4

Front

What does continuous variation?

Back

Preview of the front of card 4

Card 5

Front

What is an example of continuous variation?

Back

Preview of the front of card 5
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