cell division Flashcards
what does nucleus contain
chromosomes made of dna
what are chromosomes made of
dna
what happens during the cell cycle
genetic material is doubled then divided into two identical cells
how many stages are there in the cell cycle
3
what are stages of the cell cycle
growth, mitosis, followed by cell divison
what happens to a cell in stage one before it divides
needs to grow and increase the number of sub cellular structures such as ribosomes and mitochondria the dna replicates ti make two copies of each chromosome
what happens to the nucleus during mitosis
one set of chromosomes is pulled to each end of the cell and the nucleus divides
what happens in stage 3 of the cell cycle after mitosis
the cytoplasm and cell membrane divide to make two identical cells
why is crll division by mitosis important
needed for growth and development of multicellular organism
what is a stem cell
an undifferentiated cell which is able to differentiate and divide to firm lots of cells of the same type
what are meristems
plant stem cells that cab differentiate into any type of plant cell throughout the life of the plant
what can plant stem cells be used for
clones of plants quickly and economically
what are advantages of embryonic stem cells
can develop into most other types of cells, each cell divides ever 30 minutes, low chance of rejection and painless
what are disadvantages of enbryonic stem cells
cause death to embryo, unreliable and embryos cant give consent
what are disadvantages of adult stem cells
risk of injection from operation, painful to donate stem cells and they are safe
