Heritability: The proportion of phenotypic variation explained by genotypic variation (as opposed to environmental factors).
Broad sense heritability (H^2): Heritability taking into account all kinds of genetic interactions (additive effects of polygenes, epistasis, dominance-recessiveness, etc.)
We used finger print ridge count data to calculate the broad sense heritability of the trait. in our "population" (the class). Every student took his/her own fingerprints and did a ridge count on each one. We pooled everybody's data and proceeded with the calculation.
Narrow sense heritability (h^2)*: Heritability taking into account only the additive effects of polygenes. This measure is of interest to individuals who are interested in selection programs with the goal of shaping a population according to their interests (e.g. farmers or cattle breeders).
We used height data from students, their parents, aunts and uncles, and siblings, to calculate h^2 in a human population, since we had the data available. This kind of heritability is usually not calculated in humans.
*Actually performed a week later, on April 13.
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Lab quiz 1
During the last hour of today's lab students took the first lab quiz.
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