How Many Mutations Does It Take to Make a Whale?
Description
In this interview, Richard Sternberg breaks down the immense biological and genetic shifts required for land mammals to transition into fully aquatic whales. Moving to an oceanic life demands major overhauls across multiple physiological systems, including eyesight, hearing, respiratory control, body hydrodynamics, and reproductive anatomy. Sternberg addresses estimates on the thousands of individual morphological features that must alter during this transition, highlighting how these traits are deeply rooted in early embryonic development. He further evaluates the timeline constraints of these transitions, arguing that standard microevolutionary models struggle to account for the required genetic network shifts within the available millions of years. Ultimately, he examines how mutations targeting key developmental genes often impact multiple critical organ systems simultaneously, creating significant trade-offs that challenge simple evolutionary models.
Speaker: Richard Sternberg
Original Source Video: • National Geographic View of Fossil Record ...
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