mitosis and meiosis

Question 1

what happens in prophase?

Answer 1

chromosomes condense and centrioles start moving to opposite poles of the cell. also the nuclear envelope breaks down

Question 2

what happens in metaphase?

Answer 2

chromsomes line up along the centre of the cell and join to spindle fibres

Question 3

what happens in anaphase?

Answer 3

centromeres divide separating each pair of sister chromatids spindle fibres contract and the chromatids are pulled to opposite ends of cell by their centromere making them v shaped

Question 4

what happens in telophase?

Answer 4

chromosomes uncoil and become long and thin. they are now called chromosomes again and nuclear envelope forms around them then cytokinesis happens

Question 5

what happens in interphase?

Answer 5

three parts, gap phase 1, synthesis and gap phase 2

• gap phase 1: cell grow and new organelles and proteins are made
• synthesis: DNA is unravelled and replicated ready to divide by mitosis
• gap phase 2: cell keeps growing and proteins needed for cell division are made

Question 6

what are sister chromatids?

Answer 6

two identical copies of the same chromosome formed by DNA replication