AP Biologyeasymcq1 pt
Nondisjunction during meiosis I results in gametes with
A.an extra or missing whole chromosome
B.perfectly balanced chromosome sets
C.only extra DNA, never missing
D.no DNA at all
Explanation
Core Concept
Failed homolog separation puts both copies of a chromosome into one daughter and none in the other, producing aneuploid gametes — the cause of trisomy 21.
Correct Answer
Aan extra or missing whole chromosome
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