nucleus and cell division

2.5 & 2.6: The nucleus and the cell division
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2.5 & 2.6: The nucleus and the cell division

Slide 1 - Diapositive

Planning of today
  • SO!
  •  Repetition 2.4 cells
  • Moving on to 2.5 & (maybe) 2.6: nucleus and cell division

Slide 2 - Diapositive

Repetition 2.4: cells! 
Open your books page 112

Slide 3 - Diapositive

What is nucleus? Where do you find that?

Slide 4 - Question ouverte

The nucleus
  • Contains chromosomes
  • Chromosomes > DNA
  • Contains hereditary characteristics
  • For example you eye color

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What does DNA do?

Slide 8 - Question ouverte

DNA (Deoxyribonucleic acid)






Lots of base pairs together form genes
A base pair is made from 2 pieces, these are called bases.
T and A form a pair
C and G form a pair
Other pairs do not exist in DNA.
DNA is shaped like a ladder.
The ladder is built by using lots of  base pairs.

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Slide 14 - Question de remorquage

Try to describe what you're seeing here right now!

Slide 15 - Question ouverte

Cell division
Cell division is happening constantly in your body:
  • 3,5 kg of new skincells every year
  • 200.000.000.000 new bloodcells every day
Cells also die a lot!
  • More new cells than dead cells > growth

Slide 16 - Diapositive

Cell cycle

Slide 17 - Diapositive

Cell cycle
  • 1 daughter cell > specialised cell > heartcell, musclecell, bloodcell, etc.
  • 1 dochtercel > stem cell > parent cell
  • Stem cells can divide into new cells
  • Stem cells don't specialise,
    but they're responsible for growth
    and for the recovery of the body 
    tissues
  • Bone marrow: fat cell/bone cell/
    blood cell
skin cells
nerve cell
blood cells
embryonic stem cell

Slide 18 - Diapositive

A human stem cell divides.
The daughtercells are called cell A and cell B.
How many chromosomes are in cell A? (only use numbers)

Slide 19 - Question ouverte

Cell A is a stem cell.
Cell A divides into cell B and C.
Cell B becomes a liver cell.
What happens with cell C?
A
Becomes a liver cell
B
Becomes a body cell
C
Becomes a stem cell
D
Impossible to tell

Slide 20 - Quiz

Homework
B5. 1, 2, 5, 7, 9 + B5. 3, 4, 8
Test yourself 2.4
Flash cards 2.4
B6. 1, 2, 4, 7
 

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