Practise AP Biology 7.2.B questions by connecting molecular variation and enzyme function with survival, reproduction and fitness in different environments.
Butterflies of the genus Colias live in the
Rocky Mountains, where they experience a wide
range of temperatures. Different variants of a
particular glycolytic enzyme in the flight muscles
are optimally active at different temperatures.
Within the same population, some individual
butterflies fly most effectively at 29°C, while
others fly most effectively at 40°C. Still others
can be equally active at both temperatures.
Which of the following claims is most consistent
with the observed butterfly behavior?
Butterflies that express two variants of the
enzyme are active over a greater range of
temperature.
Butterflies that are active over a wide range
of temperatures produce greater amounts of
the enzyme.
Temperature has little effect on the activity of
butterflies.
Butterflies that are active at warmer
temperatures produce more offspring.
A