Scientific Skills Exercise: Identifying Dependent and Independent Variables, Mak

Question

Scientific Skills Exercise: Identifying Dependent and Independent Variables, Making a Scatter Plot, and Interpreting Data 26 of 26 Does geographic distance between salamander populations increase their reproductive isolation? To answer this question, researchers studied populations of the dusky salamander (Desmognathus ochrophaous) living on different mountain ranges in the southern Appalachian Mountains. The researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. Four mating combinations were tested for each pair o female B with male B) and two between populations (female A with male B and female B with male A) A and BH-two within the same population (female A A and The proportion of successful matings for each mating matings of a p matings were successful they gave it a value of 0. Then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). The reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (AA + BB) minus the sum of the proportion of successful matings of each type between populations (AB+ BA) was measured. For example, when all the s gave it a value of 1, when none of the ar combination were successful, the r The table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky (km) 15 32 Value 0 32 0 54

Explanation / Answer

Correct Answers is- The geographic distance between dusky salamander populations.

It is an independent variable. An independent variable is the one whose value is decided by the scientist or researcher. Thus, its value is known to the scientist before the experiment.

On the other hand, a dependent variable is not decided by scientist. Its value may or may not change depending on circumstances. Its value is usually affected by the independent variable.

All other options are dependent variables.

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