Evolution of the Y Chromosome

This is a part of The Meaning of Sex: Genes and Gender


How did the human Y chromosome become so small relative to its X counterpart? This animation depicts the 300-million-year odyssey of the sex chromosomes that began when the proto X and Y were an identical pair.

(Duration: 05 min 39 sec)
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Curriculum Connections:

AP Biology (2012-2013)
1.A.4.b, 3.A.4.b, 3.B.2.a
IB Biology (2016)
1.1, 3.5, 5.1, 7.2
NGSS (2013) LS
HS-LS1-1 (LS1.A), HS-LS3-1 (LS3.A), HS-LS4-1 (LS4.A)

Associated Resources