Answered: For the trichome selection experiment,…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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For the trichome selection experiment, the null hypothesis is that there will be no difference between the mean number of trichomes in the second generation compared to the parent generation. The following bar graph shows the data from the experiment, including error bars showing ± 2 standard deviations (a measure of variation for a group of data as a whole).

Based on the data provided, do you reject or fail to reject the null hypothesis? Select the answer that most strongly supports your choice and correctly justifies the response.

A. Reject the null hypothesis, as variation, shown by the error bars, is greater after selection.

B. Reject the null hypothesis, as there is no overlap between the means as shown by the error bars.

C. Reject the null hypothesis, as the error bars for the two groups show very little variation.

D. Fail to reject the null hypothesis, as the mean for the second generation is greater than that for the parent population.

The bar graph displayed illustrates the "Mean number of trichomes" in two distinct plant groups: the "Parent population" and the "Second generation." The x-axis represents these two plant groups before and after the selection process, while the y-axis indicates the mean number of trichomes, ranging from 0 to 18.

Key Observations:

- **Parent Population**: This group shows a mean trichome count of approximately 8. The error bars, which indicate variability around the mean, extend from approximately 6 to 10 trichomes.

- **Second Generation**: This group exhibits a higher mean trichome count of approximately 14. The error bars for this group range from about 12 to 16, showing an increase in both mean count and variability compared to the parent population.

The graph highlights the effect of selection on trichome number, demonstrating a significant increase in the mean count from the parent population to the second generation. This suggests that selective breeding or environmental factors may have influenced trichome production in the plants.

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