GROWTH DEVELOPMENT CHILD
SUMMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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even more cats with 12 cm long whiskers
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most cats with less than 12 cm long whiskers
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most cats with more than 12 cm long whiskers
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most cats with whiskers either less than or more than 12 cm long, very few with whiskers 12 cms
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Detailed explanation-1: -The correct answer is: Most cats will have whiskers more than 12 cm long.
Detailed explanation-2: -Stabilizing Selection When selective pressures select against the two extremes of a trait, the population experiences stabilizing selection. For example, plant height might be acted on by stabilizing selection. A plant that is too short may not be able to compete with other plants for sunlight.
Detailed explanation-3: -Stabilizing selection results in a decrease of a population ‘s genetic variance when natural selection favors an average phenotype and selects against extreme variations. In directional selection, a population’s genetic variance shifts toward a new phenotype when exposed to environmental changes.
Detailed explanation-4: -Artificial selection provides a model that helps us understand natural selection. It is a small step to go from humans selecting desirable traits in plants and animals to envisioning natural conditions acting selectively on populations and causing natural changes, especially over geological timescales.
Detailed explanation-5: -Disruptive selection occurs when both extreme traits are favored in an environment. Disruptive selection increases genetic and phenotypic diversity in a population, since more than one phenotype, or physical trait, is favored.