AP Biologymediummcq1 pt
A cell has 20 chromosomes at G₁. After S phase, it has
A.20 chromosomes, each with 2 chromatids
B.40 chromosomes
C.10 chromosomes
D.20 chromosomes with 1 chromatid each
Explanation
Core Concept
Replication doubles DNA content but not chromosome count — each chromosome now consists of two sister chromatids. Count changes only at anaphase, briefly.
Correct Answer
A20 chromosomes, each with 2 chromatids
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