What genetic factor is most likely to result in the extinction of an entire species

Answer 1

A genetic factor that can most likely result in the extinction of an entire species is a severe decrease in genetic diversity. When a species has very low genetic diversity, it becomes more susceptible to diseases, environmental changes, and other stressors that can lead to their decline and eventual extinction. This can occur because inbreeding leads to harmful genetic mutations and reduces the ability of the population to adapt to changing conditions. In a small population with limited genetic diversity, there may not be enough variability for individuals to survive and reproduce in a changing environment. Therefore, a lack of genetic diversity can significantly increase the risk of extinction for a species.