1.3 Producing New Cells Flashcards
Where are chromosomes found?
Nucleus
Why do cells divide?
For growth and repair.
To reproduce.
How many chromosomes are found in multicellular organisms?
Each cell has two sets of chromosomes. Diploid.
What is the first stage of mitosis?
Genetic material in nucleus is long and threadlike. It replicates and condenses. Chromosomes are visible and each is made of two chromatids.
What is the second stage of mitosis?
The nuclear membrane disappears and chromosomes line up along equator of cell. Spindle fibres attach to centromeres of chromosomes.
What is the third stage of mitosis?
The chromatids are pulled apart.
What happens in the rest of mitosis?
Nuclear membrane reforms around each set of chromosomes. The cytoplasm divides and two daughter cells are formed.
Why is mitosis necessary?
To maintain a full complement of chromosomes in each cell so it is able to carry out all cell functions.
