Describe the steps of mitosis. (10 Marks)
One mark is given for correctly naming each step (of which there are 7 possibilities). Another is given for a correct description of each stage.Prophase: Chromatin condenses to chromosomes / nucleolus disappears / spindles form outside the nucleusPrometaphase: Nuclear membrane breaks down / chromosomes are released / spindles attach to chromosomes at kinetochoresMetaphase: Chromosomes line up on the equator / chromosomes are moved into a lineAnaphase: Chromosomes separate at centromeres / chromosomes split in half / chromosomes split and move to opposite ends of the cellTelophase: Nuclear membranes form around each set of chromosomes / spindles break down / centromeres disappearCytokinesis: Cell splits to two daughter cells / cell pinches to two daughter cells / actin filaments contract to split cell in two
Related Biology A Level answers
All answers ▸How do the components of a plasma membrane affect the movement of substances into and out of a cell, and why is this regulation important?
Describe the flow of blood through the heart
The genetic code is described as being degenerate. What does this mean? and why ?
Explain why an enzyme catalyses only one reaction.