Chromosomes

Question 1

What are chromosomes

Answer 1

Coiled up lengths of DNA molecules

Question 2

What do chromosomes contain

Answer 2

Genes control development of characteristics

Question 3

Why is the cell cycle like mitosis used

Answer 3

growth, development and repair

Question 4

What is the first stage of mitosis

Answer 4

Growth and DNA replication

a cell not divide DNA spread out long strings

Before it divides cell grow increase amount of subcellular structure like mitochondria and ribosomes

It then duplicates DNA so one copy for each new cell. DNA copied and forms X shaped chromosomes. Each arm of chromosomes is same as other

Question 5

Second stage of mitosis

Answer 5

Chromosomes line up at centre of cell and cell fibres pull them apart. Two arms go to opposite poles of cell

Question 6

Second stage of mitosis

Answer 6

Chromosomes line up at centre of cell and cell fibres pull them apart. Two arms go to opposite poles of cell

membranes form around each sets of chromosomes these become the nuclei of the two new cells- nucleus divided

Question 7

What is cytokinesis

Answer 7

Lastly cytoplasm and chromosomes and cell membrane divide producing identical daughter cells same DNA as each other and parent cell