Textbook Question
When a fruit fly embryo first begins to develop, a large cell is generated that contains over 8000 genetically identical nuclei. What is most likely responsible for this result?
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11. Cell Division
Cytokinesis
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What occurs during cytokinesis in animal cells?
A
The nuclear envelope breaks down and spindle fibers form.
B
The cell membrane pinches inwards to divide the cytoplasm into two daughter cells.
C
Chromosomes are duplicated and separated into two nuclei.
D
The cell undergoes DNA replication to prepare for mitosis.
Verified step by step guidance1
Cytokinesis is the process that follows the end of mitosis, where the cytoplasm of a single eukaryotic cell is divided to form two daughter cells.
In animal cells, cytokinesis begins with the formation of a contractile ring composed of actin and myosin filaments beneath the cell membrane.
The contractile ring contracts, creating a cleavage furrow that pinches the cell membrane inward.
As the cleavage furrow deepens, the cell membrane continues to constrict until the cytoplasm is divided into two separate compartments.
Finally, the cell membrane fuses at the center, completing the division and resulting in two genetically identical daughter cells.
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