AP Biologyeasymcq1 pt
During which phase does crossing over occur?
A.Prophase I
B.Metaphase II
C.Anaphase II
D.Telophase I
Explanation
Core Concept
Homologous chromosomes pair as tetrads and exchange segments at chiasmata in prophase I — the source of recombinant chromosomes.
Correct Answer
AProphase I
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