Traits of economic importance in farm livestock: from single to many genes

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  • Created by: Alex
  • Created on: 28-05-13 20:24
genotype frequency
Proportion of animals with each genoytpe
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Sources of genetic variation
Segregation of genes, recombination and mutation
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Qualitative trait
phenotype falls into different categories e.g. blood type
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quantitative trait
continued variation
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Is mendelian genetics quantitative or qualitative?
Qualitative - single genes
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Is population genetics quantitative or qualitative?
Quantitative - many genes
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Threshold trait
which is inherited quantitatively, but is expressed qualitatively -discretely expressed in a limited number of phenotypes (usually two), but which are based on an assumed continuous distribution of factors that contribute to the trait
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Polygenic inheritance
One characteristic is controlled by 2 or more genes - no single gene has an overriding influence. affected by non-genetic effects
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Epistasis
The interaction of genes that are not alleles, in particular the suppression of the effect of one such gene by another
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the more loci affecting performance the
more levels of performance
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Card 2

Front

Sources of genetic variation

Back

Segregation of genes, recombination and mutation

Card 3

Front

Qualitative trait

Back

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Card 4

Front

quantitative trait

Back

Preview of the front of card 4

Card 5

Front

Is mendelian genetics quantitative or qualitative?

Back

Preview of the front of card 5
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