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BS 3 - genes and alleles
Planning
Recapitulation 5.2 (3, 5, 7 , 9)
Homework check
5.3 genes and alleles
5.3.6 You can describe what genes and alleles are.
5.3.7 You can describe what a mutation is.
5.3.8 You can describe what cancer is.
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Tekstslide
Biologie
Middelbare school
vwo
Leerjaar 3
In deze les zitten
20 slides
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interactieve quizzen
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tekstslides
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2 videos
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Lesduur is:
45 min
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Onderdelen in deze les
Planning
Recapitulation 5.2 (3, 5, 7 , 9)
Homework check
5.3 genes and alleles
5.3.6 You can describe what genes and alleles are.
5.3.7 You can describe what a mutation is.
5.3.8 You can describe what cancer is.
timer
2:00
Slide 1 - Tekstslide
Slide 2 - Tekstslide
Meiosis = a special form of cell division to create sex cells = gametes (page 110, highlight this text)
Slide 3 - Tekstslide
DNA, how it's built
Basepair
Combination of A-T or C-G. Other combinations are impossible in the DNA
Gene
Many (often thousands) of basepairs together contain the information of a gene. The order of the basepairs decides the code and its contents.
Base
Buildingblock of the DNA, there's 4 types:
A (adenine)
C (cytosine)
T (thymine)
G (guanine)
Slide 4 - Tekstslide
Time to try for yourself
Make question 1 page 122
timer
3:00
Slide 5 - Tekstslide
Genes and characteristics
1 characteristic often is made up of different genes
Genes contain information to make proteins
Slide 6 - Tekstslide
Proteins
Muscle cell - gene active that contains info for producing muscle protein
Pancreas - producing insulin (hormones are proteins)
Melanin - pigment in your eye
Slide 7 - Tekstslide
Alleles
Genes have different gene variants:
alleles
Alleles (variants) of eyecolor: blue, brown, green, etc.
Some alleles are stronger than others
Slide 8 - Tekstslide
Allele pairs
Alleles of 1 gene form pairs:
2 same alleles = 2 alleles for straight hair
2 different alleles = 1 allele for straight and one for curly
Slide 9 - Tekstslide
Time to try for yourself
Make question 5 page 124
timer
3:00
Slide 10 - Tekstslide
Which cells contain alleles for hair colour?
Pick the answer showing the most correct cells
A
Hair cells
B
Hair and head cells
C
Hair, head and brain cells
D
Hair, head, brain and eye cells
Slide 11 - Quizvraag
Which alleles could you both find in the same sperm cell?
A
Brown hair Blond hair
B
Blue eyes Green eyes
C
Brown hair Blue eyes
D
Red hair Blond hair
Slide 12 - Quizvraag
Mutations
The genotyp of a person can not change
Mutation = part of the DNA (in a cell) changes
Usually little to no
influence
Organism where mutation shows in phenotype = mutant
The moment and place of mutation are important
Slide 13 - Tekstslide
How does DNA mutate?
Mutations can be caused by
mutagenic influences:
Sunlight (UV-radiation)
Radioactive radiation (Röntgen)
Asbestos, smoke
Mutations also happen by mistake during cell division
Slide 14 - Tekstslide
Cancer, how and why?
Happens due to mutations,
Not bacteria/virus
Mutation makes cells divide continously
this creates a tumour:
- Benign: Divides slowly, stays at its spot
- Malignant: divides quickly, disrupts tissues
Metastasis > cancer cells are carried by blood/lymph. End up in different body parts and create more/new tumours
Slide 15 - Tekstslide
Time to try for yourself
Make question 2, 7, 8
timer
3:00
Slide 16 - Tekstslide
Slide 17 - Video
Time to try for yourself
Make question 3
timer
3:00
Slide 18 - Tekstslide
Homework
5.3 Questions 1 to 9 (skip summary)
Slide 19 - Tekstslide
Slide 20 - Video
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