Question

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The graph shows the results of a famous biological experiment. In the experiment, Kettlewell believed that the peppered moth demonstrated how environmental pressures influence evolution. He studied two areas. Birmingham was a rural wood, with natural conditions. Dorset was an urban, industrial area. The moths use tree trunks to camouflage themselves against birds, which are their major predators. Natural gene variations produce a light form of the peppered moth, and a dark form, meaning that they are not equally visible.



All BUT ONE statement is supported by Kettlewell's data. That is

Question options:

Dark moths had a survival disadvantage in industrial Dorset.


Light moths had a survival disadvantage in industrial Dorset.


Dark moths had a survival disadvantage in forested Birmingham.


Light moths had a survival advantage in forested Birmingham.

Answer 1

A) Dark moths had a survival disadvantage in industrial Dorset.

Dark moths had a survival disadvantage in industrial Dorset. After the introduction of industry, the dark moth population remained approximately the same in Dorset to Birmingham. However, the light moths in the rural area still had a much larger population.

~From USATestprep~

Answer 2

Answer: A) Dark moths had a survival disadvantage in industrial Dorset.

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This question can be solely answered using the data you're given! The graph is broken down by place, and then moth type.

In forested Birmingham, the green bar for the light moth is much higher than the orange one for the dark moth. That means the light moth had a survival advantage (eliminating option D) and the dark moths had a survival disadvantage (eliminating option C).

In industrialized Dorset, the green bar for the light moth is much lower than the orange one for the dark moth. That means the light moths were at a survival disadvantage (eliminating option B). The dark moths were are a survival advantage, but option A says "disadvantage," which is clearly wrong! That makes A your answer.