Karteikarten
Year 11 - Topic 2: Cell division and stem cells
Karten in diesem Stapel (17)
- 1How many pairs of chromosomes are found in the nucleus of a human?23 pairs (46)
- 2Why do cells carry out mitosis?For growth, replace worn out cells and repair damaged tissues
- 3How many cells are produced in mitosis?Two genetically identical daughter cells
- 4What is DNA replication?Where the chromosomes in the cell double in preparation for dividing.
- 5Where does mitosis take place?Body cells
- 6Why do cells carry out meiosis?For the formation of gametes (sex cells)
- 7How many cells are produced in meiosis?4 genetically different daughter cells
- 8Where does meiosis take place?Sex organs (ovaries and testes)
- 9What is meant by the term diploid?The cell contains 23 pairs of chromosomes
- 10What is meant by the term haploid?The cell contains 23 chromosomes (half the number)
- 11Which cells are haploid?Sperm and egg cells (gametes)
- 12What happens if mitosis is uncontrolled?Cancer can occur
- 13What are embryonic stem cells?Cells that have the potential to become any type of cell. Once they have become specialised, they lose this ability.
- 14What are adult stem cells?Cells that can only differentiate into certain type of cells. Once they have become specialised, they lose this ability.
- 15Why are stem cells being used in medicine?They have the potential to repair or replace damaged tissue
- 16What are the advantages and disadvantages of embryonic stem cells?Adv: Easy to extract from embryo
Adv: Produce any type of cell
Dis: Embryo destroyed when cells removed – some people think embryos have a right to life
Dis: Body recognises the cells as ‘different’ and will reject them without use of drugs - 17What are the advantages and disadvantages of adult stem cells?Adv: No embryo destroyed so not an ethical issue
Adv: If taken from the person to be treated, will not cause rejection by the body
Dis: Difficult to find and extract from tissue
Dis: Produce only a few types of cell
Informationen
- Beschreibung
- GCSE Biology Karteikarten am Year 11 - Topic 2: Cell division and stem cells, erstellt von Mrs Z Rourke am 06/02/2018.
- Erstellt von
- Mrs Z Rourke
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- 487
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