Meiosis - Details! Flashcards
In meiosis DNA replication happens in…
Interphase
Where do preparations happen in meiosis?
Interphase
In meiosis there are __ cell divisions.
2
Meiosis one creates:
2 Daughter Cells
In Meiosis II, 2 daughter cells make…
4 Daughter cells
Both Meiosis I & II have
Prophase
Metaphase
Anaphase
Telophase
Both Meiosis I & II are preceded by an..
Interphase & S Phase
Meiosis occurs only in…
Diploid, Tetraploid & Hexaploid Cells
In this phase of meiosis, chromatin becomes chromosomes. Homologous chromosomes pair up & synapse together.
Prophase I
In Prophase I, the homologous pairs form a
Tetrad - 4 Chromatids (2xSisters x2)
T/F Crossing over occurs only during Prophase 1.
TRUE!!!
When does the meiotic spindle form?
Prophase I
Tetrads will line up @ the equator here
Metaphase I
The spindles in metaphase 1 are different because they..
Attach only ONE per chromosome
The Double V appearance is typical in…
Anaphase I
In Anaphase I, the spindle apparatus ________ and centromeres __ ___ _______.
Shortens
Do not divide
In Telophase I, homologues are at opposite poles and each pole has…
1 Double Stranded Set of Chromosomes
In Telophase I, the homologues are __________ into __ _____ _______.
Seperated, 2 Haploid Cells
Will divide again into 4 daughter cells
Cytokinesis has to happen following Telophase I. T/F?
TRUE
Chromosomes will repack to chromatin in cytokinesis. T/F?
False - May reform, but not always
Therefore the nucleus & nuclear envelope…
MAY reform
This looks more like Mitosis than Meiosis!
Meiosis II
T/F Meiosis II has a 2nd S phase.
FALSE
T/F Meiosis II has a 2nd interphase.
FALSE - Already replicated
There WILL BE Centrosome replication & spindle apparatus reform in…
Anaphase II
Spindles attach __ per chromosome, from each side @ __________ in _______ __.
2, Centromere, Metaphase II
Characteristic V shape appears in..
Anaphase II
The other big part of Anaphase II?
Sister chromatids seperate!
In Telophase II, the nuclear envelope will form around…
Pronucleus
Cytokinesis occurs in Telophase II producing:
4 Daughter Cells
T/F Sperm and Eggs are functional gametes after cytokinesis.
FALSE - Sperm need to lose weight, lose non-essential organelles and grow flagellum.
Mitosis occurs in _______ cells while meiosis occurs in ___________.
Somatic
Sex Cells
Ploidy of Mitosis & Meiosis
Mitosis - 2N
Meiosis - 1N
T/F Sex cells can also divide by mitosis, but only cells that can divide by meiosis.
TRUE
In Mitosis 1 cell makes:
In Meiosis 1 cell makes:
Mitosis: One–>2 Identical Daughters
Meiosis: One–>2–>4 different cells
DNA replication happens in:
S phase/Interphase of Mitosis & Meiosis I
Not in Meiosis II
Chromatin condensis in
Mit: Prophase
Meiosis I: Prophase I
Meiosis II: Prophase II
Nuclear envelope breaks down in
Mit: Prometaphase
Meiosis I: Prophase I
Meiosis II: Prophase II
Centrosomes divide in:
Interphase (all 3)
Spindle apparatus forms:
Prophase
Prophase I
Prophase II
Tetrads form
Prophase I
Crossing over occurs
Prophase I
Chromosomes align at the equator:
Metaphase
N/A
Metaphase II
Homologues align at the equator:
Metaphase I
Microtubules attach to the centromere:
Metaphase (2 per) Metaphase I (1 per) Metphase II (2 per)
Centrosomes seperate:
Anaphase
N/A
Anaphase II
Homologues Seperate
Anaphase I
Cytokineseis
Telophase
Telophase I
Telophase II
Ploidy Reduced
Meiosis I - After Telophase I
