Use PMAT to lock in the phase order, then spend your actual study time on what happens inside each phase, because that is what exams test. PMAT is a recognition tool: it retrieves four names, not the events behind them, and it says nothing about meiosis, where most of the hard marks live. Here are the two tables to drill and the anaphase distinction that decides more marks than anything else on this topic.
Why cell division blurs together
Mitosis, meiosis I and meiosis II look almost identical in diagrams: condensing chromosomes, a spindle, an equator, things pulled to poles. The exam questions live exactly on the differences: what separates in each anaphase, whether homologues pair up, how many cells come out and with how many chromosomes.
On top sits a counting problem: a chromosome with two sister chromatids still counts as one chromosome, so a human cell after the S phase has 92 chromatids but 46 chromosomes. A word list like PMAT cannot answer "identify the phase in this drawing and justify your answer." Retrieval practice on the events, counts and comparisons can.
The mitosis phase table: drill events, not initials
Phase
What happens
prophase
chromosomes condense and become visible; the spindle begins to form; the nuclear envelope breaks down
metaphase
chromosomes line up in single file along the cell equator; spindle fibers attach to each centromere
anaphase
centromeres split; sister chromatids are pulled apart to opposite poles
telophase
chromosomes decondense; nuclear envelopes re-form around the two new nuclei
cytokinesis
the cytoplasm divides: cleavage furrow in animal cells, cell plate in plant cells
Meiosis adds three ideas that mitosis does not have, all in meiosis I. Homologous chromosomes pair up in prophase I (synapsis, forming bivalents), non-sister chromatids swap DNA at chiasmata (crossing over), and each pair orients randomly at the equator in metaphase I (independent assortment, which alone allows 2²³, about 8.4 million, chromosome combinations in one human gamete). Anaphase I then separates whole homologues, which is what halves the chromosome number. Meiosis II is essentially mitosis run on haploid cells: chromatids separate in anaphase II, giving four genetically different haploid gametes.
The comparison table exams keep asking for
Feature
Mitosis
Meiosis
number of divisions
one
two
daughter cells
two
four
chromosome number
diploid, same as parent (46 in humans)
haploid, halved (23 in humans)
genetic variation
none; daughters identical
high; crossing over and independent assortment
pairing and crossing over
do not occur
occur in prophase I
purpose
growth, repair, asexual reproduction
production of gametes
A 25-minute session that covers it
5 minutes
Blank page: write the five steps of mitosis (PMAT plus cytokinesis) with two events each, from memory. Check and mark every gap.
7 minutes
Drill the anaphase distinction until instant: mitotic anaphase and anaphase II separate sister chromatids; anaphase I separates whole homologous chromosomes with chromatids still attached.
6 minutes
Counting reps: G1 is 46 chromosomes and 46 chromatids; after S phase, 46 and 92; after meiosis I, 23 chromosomes with two chromatids each; after meiosis II, 23 and 23.
7 minutes
Reproduce the mitosis versus meiosis table from memory: divisions, daughters, chromosome number, variation, crossing over, purpose. Misses become tomorrow's first drill.
Frequently asked questions
Prophase: chromosomes condense and become visible, the spindle begins to form, and the nuclear envelope breaks down. Metaphase: chromosomes line up in single file along the cell equator and spindle fibers attach to each centromere. Anaphase: centromeres split and sister chromatids are pulled to opposite poles. Telophase: chromosomes decondense and nuclear envelopes re-form around the two new nuclei. Cytokinesis then divides the cytoplasm: animal cells pinch in two with a cleavage furrow, plant cells build a cell plate because their rigid wall cannot pinch.
As a first pass, yes: PMAT locks in the phase order in about a minute. As a study strategy, no. It is a recognition tool, and exams test production: describe what happens in metaphase, identify the phase in a drawing, explain why anaphase I is different. Retrieval practice on the events is what builds those answers, and the research gap is large, roughly 80% retention after a week for self-testing against 36% for passive review. Use PMAT once, then close the mnemonic and drill the content.
Mitosis is one division producing two diploid daughter cells genetically identical to the parent, used for growth, repair and asexual reproduction. Meiosis is two divisions producing four haploid cells, each genetically different, used to make gametes in the testes and ovaries only. The mechanical differences: homologous chromosomes pair up and cross over in prophase I of meiosis, and independent assortment shuffles maternal and paternal chromosomes. None of that happens in mitosis, which is why mitosis gives genetic continuity and meiosis gives variation.
A chromatid is one of the two identical copies of a replicated chromosome, and the two sister chromatids stay attached at the centromere. The counting rule: two attached sister chromatids count as one chromosome. So after DNA replication in the S phase, a human cell has 92 chromatids but still 46 chromosomes. Each chromatid is only counted as a chromosome once the centromere splits and it moves off on its own, which happens in mitotic anaphase and in anaphase II of meiosis.
Because different things separate. In mitotic anaphase, centromeres split and sister chromatids are pulled apart, giving each daughter cell identical chromosomes. In anaphase I of meiosis, whole homologous chromosomes are pulled apart and the sister chromatids of each chromosome stay attached, which is what halves the chromosome number from diploid to haploid. The exam tell: if a drawing shows paired chromosomes moving apart with their chromatids still joined, it is anaphase I. Chromatids do not separate in meiosis until anaphase II.
