Meiosis and Genetic Diversity

AP Biology· difficulty 3/5

The cytological basis of independent assortment is

A
$Crossing over between homologous chromosomes during prophase I$
B
$Random alignment of sister chromatids at the metaphase plate in mitosis$
C
$Cleavage of the cytoplasm during the cytokinesis stage of cell division$
D
$Random orientation of homologous chromosome pairs at metaphase I$
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Explanation

Each tetrad orients independently at the metaphase plate; this produces 2ⁿ different gamete combinations from chromosome sorting alone.

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