These species will also look more similar. The term biodiversity describes the variety of life on our planet or a specific region, measurable as the variety within species, between species, and the variety of ecosystems. Geography; Ecosystems and biodiversity under threat; A2/A-level; Edexcel; Created by: Perry; Created on: 19-03-13 17:32; Biodiversity Finally, many medicines have been based on chemicals naturally occurring in plants so plant species going extinct could have potentially held the molecules needed to cure diseases in humans. Conservation grazing or targeted grazing is the use of semi-feral or domesticated grazing livestock to maintain and increase the biodiversity of natural or semi-natural grasslands, heathlands, wood pasture, wetlands and many other habitats. Antibiotic resitant bacteria can be tested by growing bacteria, using aseptic technique and exposing them to different antibiotics. This is when species are grouped according to their evolutionary origins and relationships. Antibiotic resistance is an example of directional selection. If we wait a while, we might be able to spot a garter snake, a bullfrog, or maybe a red-winged blackbird. Biodiversity is the general term used to describe variety in the living world. It includes the concepts of species diversity, habitat diversity and genetic diversity. Farming techniques in particular reduce biodiversity. Usually three levels of biodiversity are discussed—genetic, species, and ecosystem diversity. Natural selection is the process that leads to evolution within a population. Definition of Biodiversity in the Definitions.net dictionary. a lion and a tiger can reproduce to make a liger or a tion. This introduces genetic variation to the population. Selection causes some alleles to become more frequent in a population whereas others may be lost. Biodiversity. Biodiversity is also incredibly important to humans. An index of diversity describes the relationship between the number of species in a community and the number of individuals in each species. In its Article 2, this Convention defines biodiversity as “the variability of living organisms from all sources, including, inter alia, terrestrial, ma… Biodiversity, the variety of life found in a place on Earth or, often, the total variety of life on Earth. Directional selection is when one of the extreme traits has the selective advantage. Usually three levels of biodiversity are discussed—genetic, species, and ecosystem diversity. Learn. Documenting spatial patterns in biodiversity is difficult because taxonomic, functional, trophic, genetic, and other dimensions of biodiversity have been relatively poorly quantified. Species richness is a measure of the number of different species in a community. The sequel to that first biodiversity book, naturally titledBiodiversity II(Reaka-Kudla et al. Biodiversity definition: Biodiversity is the existence of a wide variety of plant and animal species living in... | Meaning, pronunciation, translations and examples An ecosystem is the smallest unit of a living system which is functionally independent. Firstly, if humans are the cause of extinctions it is our moral duty to put measures in place to try and prevent this. The final way to measure biodiversity is in terms of genetic biodiversity. At simplest level: biodiversity is the species richness. Further, Dr. Ledoux emphasised that discussion of the review and implementation of the new framework must take place at the highest political level … This is a PowerPoint presentation for Topic 3 in the Edexcel Biology B A Level course that starts in 2015. Biodiversity can relate to a range of habitats, from a small local habitat to the Earth. The concept of biodiversity is a recent one. Genetic diversity is the number of different alleles in a population. Biodiversity is important on many levels, from the scale of an ecosystem, to the global scale. There are different meanings of biodiversity, and it can be a measure of the range of habitats, from a small local habitat to the Earth. 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 … 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 … The Convention on Biological Diversity includes variation between species (species diversity), within a species (genetic diversity) and between ecosystems (ecosystem diversity) within their definition. 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. The key for ecologists is therefore finding the balance between conservation and farming. Biodiversity ensures the maintenance of this system, and buffers a rise in atmospheric carbon dioxide concentrations. Describe what is meant by global diversity. Behavioural- Hedgehogs curling up when in danger. Match. For formula is: proportion of polymorphic gene loci = number of polymorphic gene loci / total number of loci. Measuring biodiversity: Ø. It shall not show too much of variations in the year-to-year productivity. Levels of BiodiversityBiodiversity is the variety of all species, their genetic information they contain and the ecosystems they form.There are three levels of biodiversity:• Genetic diversity is the total genetic informationcontained in the genes of all the species. Species diversity differs from ecosystem to ecosystem. Alpha diversity (2). Genetic diversityis all the different genes contained in all individual plants, animals, fungi, and microorganisms. The range decreases as the extreme traits are lost over time. An ecosystem is a community of organisms that interact with each other and their environment. Start studying AQA A-level Biology - Topic 4B - Biodiversity. Continuous refers to traits that are controlled by many genes and the environment can have an impact; this is represented graphically using a histogram. Therefore the individual with the allele is more likely to reproduce and pass the allele onto their offspring. 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