4.3.2

Phenotype

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Genotype vs Phenotype

When talking about the inheritance of characteristics, we use the words genotype and phenotype:

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Genotype

  • Genotype refers to the combination of alleles an organism has.
    • If the two alleles are different, we say that the person is heterozygous (Bb).
    • If the two alleles are the same, we say that the person is homozygous (BB or bb).
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Phenotype

  • A phenotype is an observed characteristic of an individual.
  • The phenotype is determined by the interaction between the genotype and environment.
  • Earlobes being attached or free is an example of a phenotype, where the alleles present will determine a characteristic, unless the environment interferes.

Jump to other topics

1The Nature & Variety of Living Organisms

2Structure & Functions in Living Organisms

3Organism Functions

3.1Respiration

3.2Gas Exchange

3.3Transport

3.4Excretion

3.5Coordination & Response

4Reproduction & Inheritance

5Ecology

6Biological Resources

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