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Kamssa Senior Four Self Study Work Biology

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PDF 1.61 MB 55 pages Jul 23, 2026

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Subject Biology
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1 inheritance describes how the similarities are transferred from the parent to the offspring. The similarities are in form of characteristics such as skin colour, intelligence, height and many others. Mendel was the first scientist to study genetics and inheritance. Categories of variation There are two types of genetic variations. 1. Continuous variations. These are variations that show a gradual change in individuals without a clear-cut division between the two extremes. It results into formation of intermediates. Such variations include height, intelligence, skin colour, yield in plants, etc. In such variations, organisms are usually very many around the mean/average point. 2. Discontinuous variation. This is a variation, which shows a clear-cut difference between the two extremes without intermediates. This results into expression of only two phenotypes. Examples of discontinuous variations include, tongue rolling, blood groups, sex, etc. Causes of variation Some variations are inherited and are called inherited variations while others are occupied as a result of the environment hence called environmental variations. Examples of inherited variations are blood groups, eye colour, albinism, hair, etc. Examples of environmental variations are knowledge, etc. Environmental factors that cause variations Diet Altitude Pathogens Light Graphic illustration of continuous variation Mean point No. of organisms KAMSSA SENIOR FOUR SELF STUDY WORK BIOLOGY DAY 1 TOPIC: GENETICS Genetics is the scientific study of heredity and variations between organisms while Factors that cause inherited variations Mutation Crossing over Fertilization Terms used in genetics. 1. Chromosome. These are thread-like structures bearing genes and located in the nucleus. 2. Chromatid. This is half of a chromosome split longitudinally. 3. Bivalent. This is a pair of homologous chromosomes. 4. Gene. This is a unit of the hereditable material found on the chromosome and responsible for controlling a particular trait/character. 5. Allele. This is the alternative form of the same …
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Kamssa Senior Four Self Study Work Biology, is an educational document on StudyUganda.com covering Subject Biology. This resource includes: "1 inheritance describes how the similarities are transferred from the parent to the offspring. The similarities are in form of characteristics such as skin colour, ……" (Format: PDF) — 1.61 MB, 55 pages. Added July 23, 2026.

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