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The Sizes of Eyes in a Population of Spiders Are

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The sizes of eyes in a population of spiders are monitored over several generations.The average eye size does not noticeably change, but the range of variation decreases.Assuming that no other evolutionary processes are occurring, what type of selection is most likely taking place?


Definitions:

Class Interval

A range of values in a dataset that is grouped together for the purpose of constructing a frequency distribution or histogram.

Frequency Distribution

A summary of data showing the number (frequency) of observations in each of several non-overlapping categories or bins.

Cumulative Frequency

A count of the number of occurrences that fall within certain class intervals or categories, accumulated from the beginning of a set of data up to each point.

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