NEET BIOLOGY

GENETICS AND EVOLUTION

EVOLUTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A population of moths was introduced into a desert ecosystem. Being dark-colored, the moths stood out in the sand and were easy prey for predators. Over a few years, the color of the moths changed from dark brown to light brown. What role does natural selection play in this example?
A
The change of color made their bodies tolerant to the harsh desert sand.
B
The change of color allowed them to deflect the excessive heat.
C
The change of color allowed them to hide better from predators.
D
The change of color enabled them to regulate their body temperature.
Explanation: 

Detailed explanation-1: -The process is known as industrial melanism-melanism meaning the development of dark coloured pigmentation. The Liverpool-led team found that this colour change was produced by a mutation in the cortex gene, which occurred during the mid 1800s, just before the first reported sighting of black peppered moths.

Detailed explanation-2: -The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial Revolution. The frequency of dark-coloured moths increased at that time, an example of industrial melanism.

Detailed explanation-3: -In the absence of predators, the population of both white and dark-colored moths will become equal since there is no controlling factor for any particular colored moth. The shift from white to dark-colored moths was caused by the predation of the white-colored moths, which forced them to evolve.

Detailed explanation-4: -How are the peppered moths turning from light colored to dark colored an example of natural selection? Dark moths had a higher chance of survival, longer lives, and more time to reproduce so eventually there were more.

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