कोशिश गोल्ड - मुक्त
RAPID EVOLUTION IN ACTION
How It Works UK
|Issue 204
We think of evolution as a slow, gradual process, but that’s not always the case. Some species undergo a rapid transformation

INSECT
MOTHS THAT GOT DARKER, THEN LIGHTER
The most famous example of ‘microevolution’ – evolution that occurs within 100 years and can be observed in a human lifetime – is a phenomenon we call ‘industrial melanism’. This most commonly occurs in butterflies and moths, and the most studied case is that of the peppered moth in Great Britain. Before the Industrial Revolution, the vast majority of peppered moths were white with a speckled pattern on their wings – only a small proportion of the species’ population boasted black bodies and wings. Natural selection favoured the white moths because their speckled colours allowed them to blend in with the lichen on tree bark, camouflaging them from predators.
However, in urban areas, smoke from factories changed the moths’ environment, both by killing off much of the lichen and darkening the tree bark itself. This increased the black moths’ chances of surviving to pass on their genes over the years, leading to an ever-darkening population of peppered moths. Now that the air is cleaner, the speckled form is more common once again.

THE SEEDS THAT GOT HEAVIER
यह कहानी How It Works UK के Issue 204 संस्करण से ली गई है।
हजारों चुनिंदा प्रीमियम कहानियों और 10,000 से अधिक पत्रिकाओं और समाचार पत्रों तक पहुंचने के लिए मैगज़्टर गोल्ड की सदस्यता लें।
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