How humans made corn.

The video explores the transformation of Zea mays parviglumis into modern corn through selective breeding and genetic mutations. It discusses introgressive hybridization's role in corn genetics and George Beadle's experiment on genetic differences. The video also covers the cultivation of teosinte and Aztec agricultural innovations like chinampas, highlighting the technological advancements of pre-Columbian civilizations.

What process introduced genes from Zea mays Mexicana into modern corn?

• Selective breeding

• Genetic engineering

• Introgressive hybridization

• Cross-pollination

What was the main finding of George Beadle's experiment regarding the transformation of teosinte to corn?

• Only a few regulatory genes were needed to cause significant changes.

• Teosinte and corn are genetically identical.

• It required hundreds of genes to change teosinte into corn.

• The transformation was impossible without modern technology.

Why might ancient farmers have started cultivating teosinte?

• To produce a new type of bread

• To create a source of popcorn

• To develop a new type of beverage

• To use as animal feed

What agricultural innovation did the Aztecs use to grow crops in Tenochtitlan?

• Hydroponics

• Terrace farming

• Greenhouses

• Chinampas

How did the Aztecs manage the water levels in their agricultural system?

• By diverting rivers

• By relying on natural rainfall

• By building a series of dams

• By using water pumps

What was the purpose of the Aztec canals in Tenochtitlan?

• To irrigate fields

• To transport food from chinampas

• To provide drinking water

• To drain excess water

What was the primary challenge with the water surrounding Tenochtitlan?

• It was too cold for farming.

• It was brackish and not suitable for farming.

• It was prone to frequent flooding.

• It was too deep for building structures.