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Topic 7: Genetics, populations, evolution and ecosystems

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Topic 7: Genetics, populations, evolution and ecosystems 3.7.1 Inheritance The genotype is the genetic constitution of an organism. All of the alleles that an organism carries on its chromosomes The phenotype is the expression of this genetic constitution and its interaction with the environment. observable characteristics of an organism which the result of the genotype as well as environmental factors There may be many alleles of a single gene.

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Topic 6: Organisms respond to changes in their internal and external environments

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3.6.1.1 Survival and response Organisms increase their chance of survival by responding to changes in their environment. In flowering plants, specific growth factors move from growing regions to other tissues, where they regulate growth in response to directional stimuli.

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Topic 5_ Energy Transfers in and between Organisms.

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Life depends on continuous transfers of energy. In photosynthesis, light is absorbed by chlorophyll and this is linked to the production of ATP. In respiration, various substances are used as respiratory substrates. The hydrolysis of these respiratory substrates is linked to the production of ATP. In both respiration and photosynthesis, ATP production occurs when protons diffuse down an electrochemical gradient through molecules of the enzyme ATP synthase, embedded in the membranes of cellula...

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GCSE EDUQUAS Religious Studies Hinduism

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It very difficult to find content for Hinduism hopefully this helps I did make sure to check for SPaG but I am not perfect as the ending says BBC Bitesize is where you can find these notes but they aren't as organised and you may need to do some digging.

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Topic 4- Genetic information, variation and relationships between organisms

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Biological diversity – biodiversity – is reflected in the vast number of species of organisms, in the variation of individual characteristics within a single species and in the variation of cell types within a single multicellular organism. Differences between species reflect genetic differences. Differences between individuals within a species could be the result of genetic factors, of environmental factors, or a combination of both. A gene is a section of DNA located at a particular s...

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Topic 3- organisms exchange substances with their environments

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The internal environment of a cell or organism is different from its external environment. The exchange of substances between the internal and external environments takes place at exchange surfaces. To truly enter or leave an organism, most substances must cross cell plasma membranes. In large multicellular organisms, the immediate environment of cells is some form of tissue fluid. Most cells are too far away from exchange surfaces, and from each other, for simple diffusion alone to mainta...

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Topic 2- Cells

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All life on Earth exists as cells. These have basic features in common. Differences between cells are due to the addition of extra features. This provides indirect evidence for evolution. All cells arise from other cells, by binary fission in prokaryotic cells and by mitosis and meiosis in eukaryotic cells. All cells have a cell-surface membrane and, in addition, eukaryotic cells have internal membranes. The basic structure of these membranes is the same and enables control of the passage o...

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A level Biology- Biological Molecules

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All life on Earth shares a common chemistry. This provides indirect evidence for evolution. Despite their great variety, the cells of all living organisms contain only a few groups of carbon- based compounds that interact in similar ways. Carbohydrates are commonly used by cells as respiratory substrates. They also form structural components in plasma membranes and cell walls. Lipids have many uses, including the bilayer of plasma membranes, certain hormones and as respiratory substrat...

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