Topic 8- inheritance

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Created by: Melissa
Created on: 28-09-12 16:25

Genotypes and Phenotypes

Genotype is the genetic composition of an organism. Phenotype is the characteristic that is expressed in an organism.

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Genes and Alleles

A gene is a section of DNA that is a sequence of nucleotide bases. An allele is a different form of this gene.

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Possible pairings of alleles

Two of the same allele is called homozygous. Two different alleles are called heterozygous.

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Dominant and recessive

A dominant allele always appears in the phenotype, either homozygous dominant or heterozygous. A recessive allele only appears in the phenotype if it is on its own, for example two recessive alleles, this is called homozygous recessive.

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Co-dominance

Two alleles contribute to the phenotype, they are equally dominant.

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Multiple alleles

A gene has more than two allelic forms.

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Other cards in this set

Card 2

Front

A gene is a section of DNA that is a sequence of nucleotide bases. An allele is a different form of this gene.

Back

Genes and Alleles

Card 3

Front

Two of the same allele is called homozygous. Two different alleles are called heterozygous.

Back

Card 4

Front

Back

Card 5

Front

Two alleles contribute to the phenotype, they are equally dominant.

Back

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Topic 8- inheritance