Difference between biodiversity and genetic diversity
Answers
A species is a group of organisms which share a gene pool. That gene pool can have extensive variation (genetic diversity) or all members of the species can be nearly clones. If a population is knocked down to a few individuals then recovers ("population bottleneck"), its gene pool is restricted to the genes of the few survivors, and new mutations will begin to increase diversity.
Biodiversity is the sum of the genetic diversity of all the species in an ecosystem. It can be achieved by having numerous species, species with extensive genetic diversity or both. In a complex ecosystem (numerous species), one species losing most of its genetic diversity might not have a great impact on biodiversity. A closely related species might have shared most of that diversity, so that most of the genes are not lost from the ecosystem.
Genetic diversity means that there are many variant genes within one species. Biodiversity means that there are many species within one environment