. Flashcards
(15 cards)
What is the difference between a chromosome and a chromatid?
A chromatid is 1 pair of replicated chromosomes
What happens during interphase?
Cell grows twice and DNA + organelles replicate
What occurs during prophase 1?
Homologous chromosomes intertwine to form a tetrad through synapsis
How many sister chromatids does each chromosome have during prophase 1?
Each chromosome has 2 sister chromatids
What happens during metaphase 1?
Tetrads migrate to the center of the cell and align centromeres in the middle
What occurs during anaphase 1?
Homologous chromosomes move to opposite poles as spindle fibers shorten
What is significant about the chromosomes in each daughter cell after anaphase 1?
Each daughter cell will have 1 of 2 chromosomes from each homologous pair and is genetically unique
What happens during telophase 1?
Nuclear membranes reform, spindle fibers dissolve, and the cell divides via cytokinesis
What is the role of centrioles during prophase 2?
Centrioles move to opposite sides and spindle fibers form
What occurs during metaphase 2?
Chromosomes move to the center of the cell and align
What happens during anaphase 2?
Sister chromatids separate and move to opposite poles
What is the outcome of each cell after anaphase 2?
Each cell has a single sister chromatid that is not identical due to genetic exchange
What occurs during telophase 2?
Nuclear membrane reforms around chromatids, DNA relaxes into chromatin, and cytokinesis occurs again, resulting in 4 haploids
Fill in the blank: During metaphase 1, tetrads align at the _______.
equatorial plate
True or False: Each daughter cell after telophase 2 is diploid.
False