B2: Cell Division Flashcards
What is a gene?
A section of DNA that codes for a particular characteristic
What is one reason the body needs to be able to make new cells?
Skin cells are continuously lost
What is the cell cycle?
The 3 stages of cell division
What happens in stage 1 of the cell cycle?
The two sets of 23 chromosomes mix and the DNA is replicated to make 2 identical chromosomes
What happens in stage 2 of the cell cycle?
Mitosis - chromosomes are pulled to each end of the dividing cell and the nucleus divides
What happens in stage 3 of the cell cycle?
The cell divides to make 2 identical daughter cells
What stage of the the cell cycle is the longest?
Stage 1
Why are all the cells in your body not the same?
Because they divide, grow and begin to differentiate
How do you clone a plant?
1) Scrape a tissue sample from the parent plant
2) Place the tissue samples in Agar Growth medium
3) Let the samples develop into tiny plantlets
4) Plant the plantlets into compost
Where are the 2 main places that stem cells are found?
Bone marrow and embryos
What are adult stem cells mainly needed for?
To replace old warn out cells
What type or cells can adult stem cells only differentiate to?
The type of tissue they are found in
What type of cells can embryonic stem cells become?
Any type of cell
What are stem cells?
Un-differentiated cells that can differentiate into any other types of cells
Where are embryonic stem cells stored?
In hollow balls
