Broad and Narrow Sense Heritability: Exploring the Impact of Immigration and Natural Disasters, In your own words, define broad sense heritability and narrow sense heritability. Describe a specific factor where an event like immigration or a natural disaster affected heritability and the allele frequency.

Broad and Narrow Sense Heritability: Exploring the Impact of Immigration and Natural Disasters

Broad sense heritability refers to the proportion of genetic variation within a population that is due to genetic differences between individuals (Kumar, 2020). This type of heritability takes into account all genetic influences, including both allelic and non-allelic differences. 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 type of heritability considers only allelic differences, ignoring the effects of non-allelic differences. Immigration can significantly affect heritability and allele frequency. When a new population migrates into an area, it brings with it new genetic variation that can alter the allele frequency of the existing population (Ferrari et al, 2021). This can lead to an increase or decrease in heritability, depending on the size of the new population and the nature of the genetic variation that it brings. Similarly, natural disasters can also have an impact on heritability and allele frequency. For example, a flood can reduce the genetic variation of a population by washing away individuals with certain alleles (Lahti, 2016). This can cause allelic frequencies to shift, resulting in a decrease in heritability. Cont…