Cell DIvision Flashcards
mitosis and meiosis.
when centrioles replicate?
During G2/interphase
microtubules are …………
proteins
how do plants make spindle fibres?
they don’t have centriole but with cytoplasmic proteins and membrane proteins.
centrioles are ……….. between meiosis I and II
Unchanged
Doubled
Divided
Doubled
Prophase I key features
nuclear envelope disintegrates
nucleus disappear
spindles form as centomeres get further from each other
chromosome condenses
Synapsis -chromosomes 1 from mom and 1 from dad come together and wrap around each other tightly
Homologous chromosomes pair up form bivalents
Crossing over
Metaphase I key features
Bivalents line up at he cell equator/Metaphase plate
Independent assortment of chromosomes
Anaphase I key features
Bivalents separated/ random segregation
sister chromatids both remain attached to the centromeres.
Telophase I
chromosomes assemble at either pole
Cytokinesis
2 haploids formed
Metaphase II key features
chromosomes line up at equator
Independent assortment of chromatids
Prophase II key features
chromosomes condense
nuclear envelope breaks down
spindles form
Anaphase II key features
RAndom segregation of chromatids
telophase II key features
chromatids assemble at poles
cytokinesis
4 haploid daughters forms
middle point of chromosomes/where they connect
centromeres
what is centrosome made of?
centrioles
microtubules.
