A-Level Biology Edexcel B 9BI0

Know that biodiversity can be assessed at different scales:

• within a habitat at the species level using a formula to calculate an index of diversity:

$D = \dfrac{N(N-1)}{\sum{n(n-1)}}$

• within a species at the genetic level by looking at the variety of alleles in the gene pool of a population.

Understand the ethical and economic reasons (ecosystem services) for the maintenance of biodiversity.

Understand the principles of ex-situ (zoos and seed banks) and in-situ conservation (protected habitats), and the issues surrounding each method.