During which part of the cell cycle does dna replication occur ?
Interphase (s phase)
During what stages of mitosis are chromosomes composed of two chromatids ?
(S phase) of interphase, prophase, anaphase
During what stages of mitosis are chromosomes single structures composed of one chromatid?
Anaphase and telophase
How does cytokinesis differ in plant and animal cells?
Plant- cell plate
animal - cleavage
Most cells spend the longest amount of time in ?
Series of events result in equal distribution of the chromosomes that carry the genetic information to the two new cells
Only make eggs
46 parent cells
46 daughter cells -----&--- 46 daughter cells
46 parent cells
Meiosis I -46 & 46
Meiosis II- 23,23 & 23, 23
describe the main event happening in any cell undergoing metaphase?
Spindle is binding to chromosomes, aligning them in cell equator.
why is meiosis necessary in sexually reproducing organisms?
meiosis cuts the chromosomes numbers in half; 23 chromosomes
Synapis occurs ?
meiosis I (prophase I)
Crossing over occurs?
Reduction from diploid and haploid occurs ?
Separation of chromosomes occurs?
stages of the cell cycle in Mitosis ?
Prophase, metaphase, anaphase, telophase
Cytokinesis occurs ?
Majority of the life of a cell is spent in a non dividing condition known as?
The DNA duplicates during interphase to prepare for mitosis (the next four phases that lead up to and include nuclear division). Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible.
Chromatin in the nucleus begins to condense and becomes visible in the light microscope as chromosomes.
Spindle fibers align the chromosomes along the middle of the cell nucleus. This line is referred to as the metaphase plate. This organization helps to ensure that in the next phase, when the chromosomes are separated, each new nucleus will receive one copy of each chromosome.
The paired chromosomes separate at the kinetochores and move to opposite sides of the cell. Motion results from a combination of kinetochore movement along the spindle microtubules and through the physical interaction of polar microtubules.
New membranes form around the daughter nuclei while the chromosomes disperse and are no longer visible under the light microscope. Cytokinesis or the partitioning of the cell may also begin during this stage.