Inheritance and selection definitions.

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  • Created by: elyornais
  • Created on: 31-10-15 15:03
Genotype
The genetic composition of an organism.
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Phenotype
The characteristics of an organism (often visible) resulting from its genotype and the environment.
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Gene
A length of DNA that codes for a polypeptide.
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Allele
One form of a gene.
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Homologous chromosomes
A pair of chromosomes that have the same gene loci and determine the same features.
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Dominant
An allele that is always expressed in the phenotype.
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Recessive
An allele that is only expressed in the phenotype when there is another identical allele.
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Heterozygous
When the alleles are different for a particular gene.
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Homozygous
When the alleles are the same for a particular gene.
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Sex linkage
Any gene that is carried on the X or Y chromosome.
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Co-dominance
Both alleles are equally dominant and are both expressed in a phenotype.
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Multiple alleles
More than 2 possible alleles for a particular gene.
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Gene pool
All the allels of all the genes of all the individuals in a population at any one time.
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Allelic frequency
The number of times an allele occurs in a gene pool.
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Stabilising selection
Selection that favours average individuals.
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Directional selection
Selection that favours individuals at one extreme.
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Speciation
The evolution of new species from existing species.
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Geographical isolation
When a physical barrier prevents two populations from breeding with one another.
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Other cards in this set

Card 2

Front

The characteristics of an organism (often visible) resulting from its genotype and the environment.

Back

Phenotype

Card 3

Front

A length of DNA that codes for a polypeptide.

Back

Preview of the back of card 3

Card 4

Front

One form of a gene.

Back

Preview of the back of card 4

Card 5

Front

A pair of chromosomes that have the same gene loci and determine the same features.

Back

Preview of the back of card 5
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