Two Species of Tree Frogs That Live Sympatrically in the Northeastern

question 47

Multiple Choice

Two species of tree frogs that live sympatrically in the northeastern United States differ in ploidy: Hyla chrysoscelis is diploid, and Hyla versicolor is tetraploid. The frogs are identical in appearance, but their mating calls, which females use to find mates, differ. Which difference most likely evolved first?

• A) polyploidy
• B) difference in mating calls
• C) habitat differentiation
• D) Polyploidy and different mating calls must have evolved at the same time.

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Definitions:

Random Variable

A variable whose outcomes are determined by chance, used in probability theory and statistics.

Independent

Not influenced or controlled by others; in statistics, two variables are independent if the occurrence of one does not affect the probability of occurrence of the other.

Standard Deviation

A statistic that measures the dispersion or variability of a dataset relative to its mean, used as an indicator of uncertainty or volatility.

Binomial Distribution

A probability distribution that describes the number of successes in a fixed number of independent trials, each with the same probability of success.