GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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variation that results in a limited number of phenotypes between two extremes
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variation that results in a limited number of phenotypes with no intermediates
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variation that results in a range of phenotypes between two extremes
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variation that results in a range of phenotypes with no intermediates
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Detailed explanation-1: -Continuous variation results in a range of phenotypes between two extremes, e.g. height in humans. The variation is continuous because there is an unlimited number of phenotypes between two extremes. Discontinuous variation is mostly caused by genes alone, e.g. A, B, AB and O blood groups in humans.
Detailed explanation-2: -Continuous variation is the differences between individuals of a species where the differences are quantitative (measurable) Each type of variation can be explained by genetic and / or environmental factors.
Detailed explanation-3: -Continuous variation refers to characteristics like weight or height, which change gradually. A person’s height could measure any value in between the shortest and tallest person in the world.
Detailed explanation-4: -Continuous variation Polygenic characteristics have phenotypes that can show a wide range of values, with each value following on from the value before. This is described as continuous variation .
Detailed explanation-5: -The continuous variation for complex traits is due to genetic complexity and environmental sensitivity. Genetic complexity arises from segregating alleles at multiple loci. The effect of each of these alleles on the trait phenotype is often relatively small, and their expression is sensitive to the environment.