TED-Ed: Is human evolution speeding up or slowing down? | Laurence Hurst

The video explores human genetic adaptations, focusing on Tibetans' ability to thrive at high altitudes due to genetic changes. It discusses other adaptations, like those in Siberians and Bajau people, and the ability to digest milk. Modern medicine's role in altering natural selection and increasing genetic drift is examined. The potential for rapid genetic changes through epigenetics and the impact of technology on future evolution are also considered.

What is the primary reason Tibetans can thrive at high altitudes?

• Intensive physical training

• Dietary habits

• Genetic adaptations

• Cultural practices

Which population is known for their adaptation to extreme cold?

• Tibetans

• Bajau people

• Siberians and High Arctic inhabitants

• Sub-Saharan Africans

What unique adaptation do the Bajau people possess?

• Ability to digest lactose

• High birth weights

• Large spleens for oxygen storage

• Resistance to frostbite

Why did some human populations develop lactose tolerance?

• To boost oxygen levels

• To improve digestion of meat

• To increase vitamin D production

• To enhance resistance to cold

How does modern medicine affect natural selection?

• It has no impact on evolution

• It accelerates natural selection

• It eliminates genetic variation

• It reduces selective pressures

What is genetic drift?

• A process where genetic differences are eliminated

• A random variation of genetic differences within a population

• A method of increasing selective pressures

• A technique to enhance genetic mutations

What is the current understanding of epigenetic modifications in evolution?

• They are proven to cause permanent changes

• They are known to eliminate genetic diversity

• Their long-term effects are still uncertain

• They have no impact on gene expression