Birth weight in humans is a trait that is subject to stabilizing selection Which of the following graphs represents stabilizing selection: A. Probability of survival 100% 0% 2 4 6 8 10 12 Birth weight (lbs) B. Probability of survival 100% 0% 2 4 6 8 10 12 Birth weight (lbs) C. 100% 0% 2 4 6 8 10 12 Birth weight (lbs) D. 100% 0% 2 4 6 8 10 12 Birth weight (lbs) Probability of survival Probability of survival
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This means that individuals with traits closer to the average of the population have a higher probability of survival and reproductive success. Show more…
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(A) Stabilizing selection (B) Directional selection (C) Disruptive selection (D) Genetic drift (E) Convergent evolution The majority of human birth weights is between 6 and 9 pounds
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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.
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
Katlin K.
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