Assignment task:
Multiple factors can influence both types of heritability. Think logically - what are some things that can affect genes? We've already talked about them. Population size - remember bottlenecks? Immigration/emigration, the influx or loss of (an) individual(s). Environmental disasters like hurricanes, floods, and earthquakes. Anything that has the potential to cause an increase or decrease in allele frequency affects heritability.
Define broad sense heritability and narrow sense heritability. Describe a specific factor where an event like immigration or a natural disaster affected heritability and allele frequency.