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Crash Course
Heredity: Crash Course Biology
Hank and his brother John discuss heredity via the gross example of relative ear wax moistness.
Howard Hughes Medical Institute
Hhmi: Biointeractive: Sex Determination: Meiosis
See how an X or Y chromosome carried by a sperm cell, determines the sex of the offspring in this video. [5:52]
Khan Academy
Khan Academy: Biology: Sex Linked Traits
An explanation of gender determination. [14:19]