Biology / Unit 5 Bio 1057 short lesson, about 20 seconds
The Physical Basis of Independent Assortment in Meiosis I
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The idea
Independent assortment's physical basis is the random orientation of different tetrads at metaphase I, since each pair orients toward the poles independently of every other.
In practice
A cell with two chromosome pairs can orient them two distinct ways at metaphase I, producing all four possible gamete combinations.
Where people slip
This law applies chromosome by chromosome — loci sharing one do not assort independently.
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