Biol 1 DNA & Variation flashcards

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  • Created by: Emilyy
  • Created on: 16-03-14 11:51
Gene
Sequence of DNA molecule that codes for a protein
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Allele
Variation of a gene e.g. blood type
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Locus
Location of a gene on a chromosome
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Triplet
Codes for an amino acid
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Protein
Chain of amino acids joined together in a specific order, different proteins have different sequences of amino acids
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Introns
Don't code for the amino acid - they are removed during protein synthesis
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Exons
Do code the amino acid - they are exported
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Mutation
Change in DNA sequence - can produce new alleles
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Substitution mutation
a base changes into another base e.g. A to G
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Insertion/deletion mutation
When a base is added or deleted from the DNA, it causes a 'frameshift' which is likely to affect all the following amino acids in the sequence
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Mutagenic agent
Something that causes a mutation e.g. UV or nuclear radiation
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Inter specific variation
Variation that exists between members of DIFFERENT species
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Intra specific variation
Variation that exists between members of the SAME species
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Genotype
The specific combination of alleles possessed by an organism (Tt=tall, t=short, genotype=Tt)
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Phenotype
Physical/visual appearance of the genotype Tt=genotype Tall=phenotype
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Polygenic
Phenotype/trait controlled by more than one gene (continuous variation)
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Monogenic
Phenotype/trait controlled by a single gene e.g. sex (catergoric)
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Statistical tests
Prove that trend is significant = didn't occur due to chance
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Standard deviation
measure of how spread out the data is e.g. large deviation = greater spread
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Other cards in this set

Card 2

Front

Allele

Back

Variation of a gene e.g. blood type

Card 3

Front

Locus

Back

Preview of the front of card 3

Card 4

Front

Triplet

Back

Preview of the front of card 4

Card 5

Front

Protein

Back

Preview of the front of card 5
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