These have been made according to the specification and cover all the relevant topics in the syllabus for examination in May/June as well as October/November and March. 07.11G. Learn Cell Division by Mitosis in Just 2 Videos. Therefore, sickle-celled genotypes are favourable in countries where malaria is highly prevalent. IGCSE Edexcel Xavier DANIEL, Ph.D. Human Influence on Ecosystem. Fitness is defined as the probability of an organism surviving and reproducing in the environment in which it is found. The usual story behind Darwin's theory of evolution gives the impression that he came up … Continuous variation – Results in a range of phenotypes between two extremes i.e. This is the second of two quizzes looking at that topic and it focusses in particular on the process of natural selection. Coordination and Response. The … Made by expert teachers. 18-variation and selection ; 19-organisms and their environment ; 20-biotechnology and genetic engineering ; 21-human influences on ecosystems ; paper-2-topic-wise past papers . Start studying IGCSE Biology - Variation, Natural and artificial selection. CIE Biology GCSE 18: Variation and Selection Notes (Content in bold is for Extended students only) KWWSV ELW O\ SPW FF KWWSV ELW O\ SPW HGX KWWSV ELW O\ SPW FF This work by PMT Education is licensed under CC BY-NC-ND 4.0. This page contains the detailed and easy notes for GCSE Edexcel Natural selection and gentic modification Biology ... Inheritance; Genetic Diseases; Sex Determination; Variation; Evolution; Selective Breeding; Genetic Engineering; Speciation; Theories of Evolution; Speciation; REPRODUCTION – Making more offspring’s. igcse Biology study notes/Igcse Biology Revision Notes-2022-syllabus; igcse physics chapter wise past papers; IGCSE Physics study notes; IGCSE Quiz; igcse-videos; IGCSE Additional Math Topic -wise past papers; IGCSE Biology Topic questions-Chapter wise questions ; IGCSE Topic wise Past Paper-online shop; The Cambridge Resource Shop; IGCSE Biology study notes-2022-syllabus. PowerPoint presentations following the IGCSE Cambridge textbook for teaching the IGCSE Biology course. IGCSE Biology Chapter 18 - Variation and Selection TOPICS FOR 0620- … … non-life threatening sickle cell trait, HnHn – 100% abnormal Hb, life-threatening condition, A person with sickle cell anemia (HnHn) will be fully protected against malaria, but likely to die from sickle-cell disease, A person that has no sickle cell anemia (HNHN) has no protection from malaria, and is therefore likely to contract the disease, A person that is a sickle-cell carrier (HNHn) gains moderate malarial protection, and will not die from sickle cell disease, Small leaves to reduce surface area for evaporation, Less stomata to reduce the surface area for diffusion, Sunken stomata to maintain humdity around stomata (and therefore reduce diffusion of water out of the plant), Rolled leaves to maintain humidity around the stomata, Wide flat leaves to increase surface area for floatation and to be exposed to as much light as possible, Reduced plant structure as there is less need for a rigid structural support, Thin waxy cuticle as water preservation isn’t as important, Small roots as water can be obtained directly through the leaf and stem, Stomata are open on the upper side of teh leaf in order to maximize gas exchange without worrying about too much water, There are compeittion for resources among individuals within the population, The most ‘fit’ individuals that are more adapted to the environment will survive and reproduce, Fitter individuals pass on their genes/alleles to their offspring, Selection by humans of individuals with desirable traits, Crossing these individuals to produce next generation, Selection of offspring showing the desirable characteristics, Over many generations this can improve the quality of crop plants and domesticated animals. … Advantages of sexual or asexual reproduction triple only Advantages of sexual reproduction: • produces variation in the offspring • if the environment changes variation gives a survival advantage by natural selection • natural selection can be speeded up by humans in selective breeding to increase food production. These plants have adaptive features which allow it to maximize water uptake and minimize water loss. Hydrophytes are plants that grow on or in water. Correct answers are indicated as well as explanations of the reasons for rejecting the alternatives. Full notes are given with the materials. Search for: IGCSE AID. There are two kinds of variation: continuous and discontinuous. The steps are as follows: There is variation within a population Many offspring are produced Igcse Human Biology Revision Notes IGCSE Biology Notes (Year 11) 13. Variation is all the differences which exist between members of the same species. Characteristics and Classification of Living Organisms, 20. 14. The most important ones that you need to be aware of is: Sickle cell anemia is caused by the mutation in a gene that codes for hemoglobin. Learn vocabulary, terms, and more with flashcards, games, and other study tools. A tan, you […] Biology - Natural Selection (AQA) One subject looked at in GCSE Science is evolution. Sickle-cell anemia provides protection against malaria, because the parasites cannot penetrate sickle-celled RBCs. Define variation as differences between individuals of the same species Variation is the differences… Skip to content. Natural selection describes the concept that for a given environment, organisms with the most beneficial features are ‘selected’ to survive and pass on their genes to the next generation. 17. Business Studies – 0450; Economics – … Upon the use of antibiotics, most bacteria of a certain strain will die. Variation in species can be genetic, environmental or a combination of both. Eventually, the antibiotic will be ineffective due to the abundance of resistant bacteria. tongue rolling, HN Hn – Mostly normal Hb, but some abnormal Hb found i.e. Variation is beneficial to a species as it allows natural selection to occur and … Discuss the answers as a class. Now, let’s take a look at the IGCSE syllabus for each subject. Powered by Create your own unique website with customizable templates. 16. Answer the following 1. Competition (for food, mates etc) causes a struggle for existence. Menu. Food and Digestion. Following the activity move onto the question prompts on slide 18. A positive natural selection might occur for a variation which led to a grass dwelling beetle to be coloured green. 221. Exams Revision . Biology Revision and Exam Tips Learn ALL of AQA Biology Paper 2 in One Video. IGCSE Notes AS/A Level Notes EXAM NEWS About Variation and Natural Selection. Consider the three possible genotypes (N = normal, n = abnormal).
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