Evolution of Thumbs and the Role of Sonic Hedgehog

What did the ancient Greeks refer to as the 'second hand'?

• The pinky finger

• The thumb

• The index finger

• The middle finger

Why is Dr. Neil Shubin's work as a fish paleontologist relevant to a medical school?

• He studies the diet of ancient fish.

• He explores the evolutionary history embedded in human anatomy.

• He develops new surgical techniques.

• He teaches marine biology.

What is Tiktaalik, and why is it significant?

• A transitional fossil between fish and land animals

• A type of ancient plant

• A dinosaur with wings

• A modern-day amphibian

What anatomical features of Tiktaalik resemble those of humans?

• Its scales and fins

• Its upper arm, forearm, and wrist bones

• Its eyes and nostrils

• Its gills and tail

How do embryonic buds contribute to limb formation?

• They form the brain and spinal cord.

• They create the digestive system.

• They push out of the body and form paddles that become hands.

• They develop into the heart and lungs.

What role does the Sonic hedgehog gene play in limb development?

• It regulates the heartbeat.

• It controls the growth of hair.

• It signals the formation of different fingers.

• It determines the color of the skin.

What happens if there is too much Sonic hedgehog expression in an embryo?

• The embryo develops a tail.

• The embryo's skin changes color.

• The embryo loses all fingers.

• The embryo develops extra fingers.

In which animals is the Sonic hedgehog gene found?

• Only in birds

• Only in mammals

• In fish, frogs, chickens, mice, and hedgehogs

• Only in humans

What is the main theme of Neil Shubin's book 'Your Inner Fish'?

• The history of marine life

• The migration patterns of birds

• The evolutionary connection between humans and ancient fish

• The diet of prehistoric animals

What message does the video conclude with?

• A call to explore outer space

• An invitation to learn more about evolutionary biology

• A warning about climate change

• A discussion on modern technology