What Did Cohn and Tickle's Research Suggest About Snake Evolution

question 48

Multiple Choice

What did Cohn and Tickle's research suggest about snake evolution?

• A)The second stage in snake evolution, the reduction or complete absence of forelimbs, is caused by other genetic variations that appeared some time after the altered expression pattern of Hoxc6.
• B)The second stage in snake evolution, the reduction or complete absence of forelimbs, is caused by other genetic variations that appeared some time after the altered expression pattern of Hoxc8.
• C)The second stage in snake evolution, the reduction or complete absence of hindlimbs, is caused by other genetic variations that appeared some time after the altered expression pattern of Hoxc6.
• D)The second stage in snake evolution, the reduction or complete absence of hindlimbs, is caused by other genetic variations that appeared some time after the altered expression pattern of Hoxc8.

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Definitions:

Lianas

Woody vines that climb up trees and other structures to reach sunlight in dense forest environments.

Epiphytes

Plants that grow on other plants without drawing nutrients from their hosts, obtaining moisture and nutrients from the air or rain.

Tropical Rain Forest

A dense, warm, wet forest found near the equator, known for its biodiversity and high rainfall.

Headwaters

Headwaters are the source or uppermost reaches of a river or stream, often located in high elevation areas or mountainous regions.