2: Mitosis

Question 1

What is cell division

Answer 1

A mulitcellular organism begins as a single cell. That cell divided repeatedly to produce all the cells in the adult organisms

Question 2

What is mitosis

Answer 2

Cell division involved in growth. Also involved in the production of new cells to repair damaged tissue, and asexual reproduction- a parent gives rise to a genetically identical offspring.

Question 3

What is the cell cycle

Answer 3

Continuous cycle of growth and mitotic division. S phrase is DNA replication. G2 phrase, mitosis, cytokinesis and G1.
Most of the time the cell is in interphase. G1 and g2 the cell is in normal activities. And G and S stages make up interphase.
DNA replication takes place in the S stage. 2 identical. Copies of each DNA molecule.

Question 4

What happens to the chromosomes during cell cycle

Answer 4

Each DNA molecule forms 1 chromosome, so after replication is complete each chromosome is made of 2 identical DNA molecules. They are called chromatids and remain joined at the centromere

Question 5

What is prophase

Answer 5

Chromosomes condense, ceontroles duplicate. Centrioles pairs love towards each pole and spindle begins to form

Question 6

What happens in metaphase

Answer 6

Nuclear envelope disappears. Centrioles pairs are at the plea. Spindle is completely formed, chromosomes continue to condense, microtubulee of spindle attach to centromere if chromosomes. Microtubulee pull on centromeres and arrange in centre

Question 7

What happens in anaphase

Answer 7

Links between sister chromatids break. Centromere if sister chromatids love apart and pulled by the microtubules of the spindle.

Question 8

What happens in telophase

Answer 8

Sister chromatids are no separated and reach opposite poles

Question 9

What happens in cytokinesis

Answer 9

Chromosomes decondense. Nuclear envelopes appear around the chromosomes at each pole. The spindle disappears. The cell divided into 2 cells, by unfolding of the plasma membrane in animal cells or by formation of a new cell wall and plasma membrane in plants

Question 10

Core practical 3- making a root tip squash

Answer 10

Try to find cells going through cell cycle. Root tip of a young plant. Need to squash the root so its a single layer. Stain the dna so chromosomes show up clearly whenyou observe. Use acetic orcein which makes it red.
Need HCL to break cells apart.