The term biodiversity (from “biological diversity”) refers to the variety of life on Earth at all its levels, from genes to ecosystems, and can encompass the evolutionary, ecological, and cultural processes that sustain life. Genetic diversity is all the different genes contained in all individual plants, animals, fungi, and microorganisms. Below is an example using the human classification: Individuals can also be classified using the phylogenetic system. Over many generations, there will be an increase in the frequency of this allele within the population. Start studying AQA A-level Biology - Topic 4B - Biodiversity. Created by. Attributes of a stable community- 1. A middling birth weight is the selective advantage as extremely low birth weights may be disadvantageous to survival due to the underdevelopment of the baby and an extremely large birth weight may lead to complications in the birth. … This is a PowerPoint presentation for Topic 3 in the Edexcel Biology B A Level course that starts in 2015. To maintain life-supporting systems and essential ecological processes. In fact, “biodiversity” is nowused sometimes to mean “life” or “wilderness” or other conservationvalues. Think you’re done? Assess the extent to which China is a threat to the USA's status as the only current superpower. Extinction is when a group of organisms fail to adapt to the environment and therefore cannot survive. Extinction of species is negative for many reason ranging from ethical, economical and medicinal. Measuring biodiversity: Ø. Biodiversity is usually explored at three levels - genetic diversity, species diversity and ecosystem diversity. Biodiversity is an essential part of the solution to climate change. Community-level regulation (6–8) is important because it may dampen biodiversity fluctuations in the face of environmental change and may cause species richness (S) or total abundance (N) to return toward a central level following a strong perturbation. You have not even scratched the surface of the biodiversity wi… 4.4 biodiversity at global, national and local levels 88 4.5 india as a mega diversity nation 89 4.6 hotspots of biodiversity 90 4.7 threats to biodiversity: habitat loss, poaching of wildlife, man-wildlife conflicts 91 4.8 endangered and endemic species of india 94 4.8.1 … Biodiversity encompasses the genetic variety within each species and the variety of ecosystems that species create. Having a low biodiversity isn’t necessarily an issue. Documenting spatial patterns in biodiversity is difficult because taxonomic, functional, trophic, genetic, and other dimensions of biodiversity have been relatively poorly quantified. Check out Adapt — the A-level & GCSE revision timetable app. It is estimated that there are above 30 million species on the earth. This is sealed and left to grow at 25C for a few days. Species diversity differs from ecosystem to ecosystem. An ecosystem is the smallest unit of a living system which is functionally independent. Any discs that do not have an inhibition zone around them indicates that the antibiotic did not kill the bacteria. Biodiversity definition is - biological diversity in an environment as indicated by numbers of different species of plants and animals. This A-Level Biology section of Revision Science explains biodiversity classification including examples. Genetic diversity. Biodiversity refers to the variety of species found in an ecosystem. The closest relations of an organism are members of its own species. This includes disinfecting all surfaces you will work on, washing your hands with soap and sterilising all equipment. In 1984, Edward O. Wilson published “Biological diversity“, which puts forward for the first time the idea of biological diversity. HelpCenter Definition. Gravity. Biodiversity at this scale is important because it ensures ecosystem stability. Biodiversity refers to the variety of species found in an ecosystem. Farming techniques in particular reduce biodiversity. Extinction. The way species are named is universal. It must be either resistant or resilient to seasonal disturbances. The term BIODIVERSITY was first coined by the entomologist E.O. A neologism from biology and diversity, it refers to the variety of life on the planet. This is when species are grouped according to their evolutionary origins and relationships. 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