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The Impact of Immigration and Natural Disasters: Broad and narrow Sense Heritability
Broad-sense heritability is the amount of genetic variation in a population due to differences between people (Kumar 2020). This kind of heritability includes all genetic influences. Narrow sense heritability, on the other hand, refers to the proportion of genetic variation within a population that is due to allelic differences between individuals (Cavalli-Sforza & Feldman, 2016). This form of heritability does not consider non-allelic variation. It only takes into account allelic differences. The effects of immigration on heritability, allele frequency and other factors can be significant. New genetic variation can affect the allele frequencies of existing populations when a population moves into an area. Based on how large the population is and what genetic variation it contains, this can cause an increase or decrease of heritability. The same goes for natural disasters. They can impact heritability as well as allele frequency. Floods can result in a decrease in genetic variation by washing out individuals carrying certain alleles. (Lahti 2016, 2016). The result can be a shift in allelic frequencies which may lead to a reduction in heritability.
