A-Level Biology Specification

Edexcel B 9BI0

Section 3.3: Biodiversity

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#3.3i

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.

#3.3ii

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

#3.3iii

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