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.

The butterflies which fly most effectively at 29 degrees Celsius produce one type of variant for the particular glycolytic enzyme in the flight muscles. Whereas the butterflies which fly at 40 degrees Celsius produce anther type of variant for the particular glycolytic enzyme in the flight muscles.

The butterflies which are effective at both temperatures i.e 29 degrees Celsius and 40 degrees Celsius can produce both forms of the variant for the particular glycolytic enzyme in the flight muscles.

marianaegarciaperedo marianaegarciaperedo · Answer 2 · 2021-12-07T12:54:59+01:00

Butterflies who inhabit a wide range of temperatures need to produce enzymes that improve their flight. The correct option is 1. Butterflies that express two variants of the enzyme are active over a greater range of temperature.

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We know that different variants of the enzyme are optimally active at different temperatures. So there must be an enzymatic variant per temperature or temperature range.

Some individuals of the population live in areas where the temperature is 29ºC, so they produce one type of enzyme. These individuals can fly at 29ºC but not at 40ºC.

Some other individuals live under 40ºC temperature, synthesizing another variant of the enzyme. These individuals can fly at 40ºC but not at 29ºC.

Since this is the same population, there must be individuals who can fly at both temperatures. This is the third group of butterflies.

These individuals are equally active at both temperatures, meaning they can fly at 29º and 40ºC. So they need to have two variants of enzymes that make them good at flight. The one needed to fly at 29ºC, and the other enzyme needed at 40ºC.

1) Butterflies that express two variants of the enzyme are active over a greater range of temperature.

This is correct. These butterflies need both variants of the enzyme to fly at both temperatures, covering a wider range.

2) Butterflies that are active over a wide range of temperatures produce greater amounts of the enzyme.

This is not correct. Independently of the amount of enzyme, they need the two variants to express a good flight at both temperatures.

3) Temperature has little effect on the activity of butterflies.

This is not correct. Temperature influences the butterflies. This is a limiting factor for individuals.

4) Butterflies that are active at warmer temperatures produce more offspring.

This is not correct. According to this information, we can not know which butterfly produce more offspring.

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