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B1 Key terms and definitions
Term Definition
Gene A short length of DNA in a chromosome
Chromosome A strand of DNA
Allele A different copy of the same gene
Genotype The genetic coding for a characteristic
Example: blue eyes (bb)
Phenotype The physical appearance of a characteristic
Example: the phenotype…

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Artificial cloning Where a donor egg cell has the nucleus removed and a
donor adult cell is implanted in its place, this means the
egg has a full set of genes without reproduction.


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