Multiple Choice
In which division of meiosis do chromosomes split at the centromere and sister chromatids are separated?
3
views
9. Mitosis and Meiosis
Meiosis
Struggling with Genetics?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
At the end of which stage of meiosis will there be twice the number of chromatids compared to the beginning?
A
Anaphase II
B
Metaphase II
C
Telophase I
D
S phase (prior to meiosis I)
Verified step by step guidance1
Recall that the number of chromatids doubles during the S phase of the cell cycle because DNA replication occurs, resulting in each chromosome consisting of two sister chromatids.
Understand that meiosis consists of two divisions: meiosis I and meiosis II, with stages including prophase, metaphase, anaphase, and telophase in each division.
Recognize that at the beginning of meiosis I (after S phase), the cell has chromosomes each made of two sister chromatids, so the chromatid number is doubled compared to before S phase.
Note that during meiosis I, homologous chromosomes separate, but sister chromatids remain together, so the number of chromatids does not double further during meiosis I stages like telophase I.
Conclude that the stage at which the number of chromatids is twice the original (pre-S phase) is actually after the S phase, before meiosis I begins, not during any stage of meiosis itself.
Related Videos
Related Practice
