About 60 million years ago, an asteroid impact caused mass extinction of all non-avian dinosaur species. The avian lineage survived, however, leading to todays modern birds. What type of genetic drift is this?

EVOLUTION OF A POPULATION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

About 60 million years ago, an asteroid impact caused mass extinction of all non-avian dinosaur species. The avian lineage survived, however, leading to today’s modern birds. What type of genetic drift is this?

A	Founder Effect
B	Bottleneck Effect
C	Darwinian Effect
D	Migration Effect

Explanation:

Detailed explanation-1: -Chemical reactions in the atmosphere caused acid rain and long-term global warming, all of which extinguished non-avian dinosaurs. However, at the same time, massive lava flows erupted across what is now southwest India. The eruptions probably caused many of the same effects as the asteroid impact.

Detailed explanation-2: -The leading theory is that a huge asteroid or comet slammed into Earth 65 million years ago, blocking sunlight, changing the climate and setting off global wildfires.

Detailed explanation-3: -The impact site, known as the Chicxulub crater, is centred on the Yucatán Peninsula in Mexico. The asteroid is thought to have been between 10 and 15 kilometres wide, but the velocity of its collision caused the creation of a much larger crater, 150 kilometres in diameter-the second-largest crater on the planet.

Detailed explanation-4: -The Alvarez hypothesis posits that the mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth.

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