Referring to the above figure of stabilizing selection, which details infant mortality (in blue) and proportion of individual infant birth weights (in red) which of the following statements is TRUE? No selection for birth weight is occurring Selection occurs for large birth weights with low variation Selection occurs for intermediate birth weights with high variation Selection occurs for intermediate birth weights with low variation
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In this case, it is stabilizing selection where the intermediate trait is favored. Show more…
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(b) For example, very small and very large babies are the most likely to die, leaving a narrower distribution of birthweights. The following is a description of the above figure for screen readers. This figure shows the frequency of human newborns of various weight classes that have a normal curve with a mean of 7 pounds. The line graph shows maternal mortality by baby birth weight, and it is high at heavy and low birth weights, and is lowest at approximately 7 pounds. directional selection disruptive selection stabilizing selection
Sri K.
Which of these statements applies to a mode of natural selection? A. Stabilizing selection eliminates intermediate phenotypes of the distribution. B. Disruptive selection can eventually eliminate polymorphisms. C. Directional selection always reduces variability in the population. D. Directional selection favours phenotypes at one extreme of the distribution.
Adi S.
Stabilizing selection differs from directional selection because a. in the former, phenotypic variation is reduced but the average phenotype stays the same, whereas in the latter both the variation and the mean phenotype change. b. the former requires genetic variation, but the latter does not. c. intermediate phenotypes are favored in directional selection. d. None of the choices is correct.
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