U5 B1 2HVTTO

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

B1 Genotype and phenotype

• Take off your jacket
• Put your things on your desk

       Book, notebook, pencil case

• Bag on the floor
  
• Read pages 98-100

Lessongoals

• You can describe what the genotype and phenotype are.
• You can explain that cells only use  the hereditary information that they need.

A human has ... chromosomes in each cell. (number)

What features of your body are hereditary?

How much influence does your DNA have on your:
Hair colour

none

some

much

Complete, only your DNA decides it

How much influence does your DNA have on your:
Height

None

Some

Much

Complete, only your DNA decides it

How much influence does your DNA have on your:
Weight

None

Some

Much

Complete, only your DNA decides it

How much influence does your DNA have on your:
sexual orientation (straight, gay, etc.)

None

Some

Much

Complete, only your DNA decides it

DNA

• Humans: 46 chromosomes in each body cell
• DNA stores information for all of your hereditary characteristics (example: blue eyes)
• Complete DNA = Genotype
• Genotype is created during fertilization

Chromosomes form pairs.

1 pair contains information for the same characteristics

Phenotype

• All your characteristics = phenotype
• Phenotype is a combination of: genotype (DNA) and influences from your surroundings

Examples:

• Hair colour
• Weight
• Voice
• Lung capacity
• Build of your muscles
• Size of your feet
• Blood pressure
• etc

Examples:

• The weather
• How much you eat
• How much you exercise
• What you do each day
• etc.

Give an example of an influence making changes to your phenotype.

On or off

• Every body cell contains all genes (genotype)
• Genes that are on do something in the cell.
• Genes that are off do nothing (for that cell)
• Depends on the type of cell and place in the body

Example:

 Stomach cell : genes for hair colour are off.

 Stomach cell : genes for production of acid are on

What you should do:

• Read pages  98-100
• Do asgmt  1-4,6-8, 9c, 10c pgs. 100-105

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zs = Working in Silence

• No asking questions
• Silent, don't disturb anyone
  
• Stay at your  desk

What you should do:

• Read pages 98-100
• Do asgmt 1-4,6-8, 9c, 10c pgs. 100-105

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zw = Working with whispering

• Teacher is available for questions
• Only whisper with the student next to you
• Stay at your  desk

Tidy Duty

Today these people are on tidy duty

• Desks: empty and straight
• Chairs:  underneath the desks
• Floor: no rubbish