Chromosome & Chromatid Numbers Through Mitosis and Meiosis

Vocabulary-style flashcards summarizing the chromosome and chromatid counts at every major phase of mitosis, meiosis I, and meiosis II.

Prophase (Mitosis)

Each cell contains 46 chromosomes and 92 chromatids.

Metaphase (Mitosis)

46 chromosomes and 92 chromatids are present.

Anaphase (Mitosis)

Separate

92 chromosomes

92 chromatids are counted as they move apart.

Telophase (Mitosis)

Separated chromosomes reach poles;

each nascent nucleus has 92 chromosomes

92 chromatids (one per chromosome).

End of Mitosis (Cytokinesis)

Two daughter cells form,

each with 46 chromosomes and

46 chromatids.

Prophase I (Meiosis I)

46 chromosomes (in homologous pairs) and 92 chromatids per cell; crossing-over begins.

Metaphase I (Meiosis I)

Homologous pairs align at the metaphase plate; 46 chromosomes and 92 chromatids.

Anaphase I (Meiosis I)

Homologous chromosomes separate; still 46 chromosomes and 92 chromatids per cell.

Telophase I (Meiosis I)

Chromosomes reach poles; each nucleus still has 46 chromosomes and 92 chromatids.

End of Meiosis I (interkinesis)

Two haploid cells form, each with 23 chromosomes and 46 chromatids.

Prophase II (Meiosis II)

Each haploid cell begins with 23 chromosomes and 46 chromatids.

Metaphase II (Meiosis II)

Chromosomes line up singly; 23 chromosomes and 46 chromatids in each cell.

Anaphase II (Meiosis II)

Sister chromatids separate; 46 chromosomes and 46 chromatids in each cell during separation.

Telophase II (Meiosis II)

Chromosomes arrive at poles; each nucleus temporarily has 46 chromosomes and 46 chromatids.

End of Meiosis II (Cytokinesis)

Four genetically unique gametes result, each with 23 chromosomes and 23 chromatids.