Download Topic 4 Wearing Your Genes Genetics

September 23, 2015
Topic 4
Wearing Your Genes
Genetics
In this topic you will...
1) investigate the transmission
of characteristics from
parents to children.
2) Look at things that are the
same and different from your
parents
3) Look at nature vs. nurture
4) Look as examples of
dominant and recessive
characteristics
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TWO KINDS OF VARIATION
CONTINUOUS VARIATION
- Range of possibilities for each of these traits
- Eg. Skin colour, height and hair colour.
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DISCRETE VARIATION
- limited number of possibilities
- the knowledge of genetics has focussed
on discrete variation
Eg. Tongue roller, blood types
Blood Type website
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LAB TIME
Observing Human Characteristics
Complete the lab on the handout provided to you
Let's go thorough the discrete traits together...
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Mid-digital Hair or No mid-digital Hair
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Tongue Rolling and Non-rolling
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Attached and Unattached Earlobe
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Curved and Straight Thumb
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Pointed and Smooth Hairline
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DOMINANT AND RECESSIVE
- During sexual reproduction
traits like tongue rolling are
passed from parents to
offspring.
- Children do not always show
their parents traits
- Genes for traits are inherited
in pairs
• One from the mother and
one from the father.
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- Dominant trait is the visible
one when different genes are
present
- Recessive trait only appears
when it is inherited from
both parents.
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Dominance VS. Common
- Polydactyly (having six fingers) is a dominant trait
- dominance and frequency are not the same thing
- just because something is dominant does NOT mean it is
common.
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2mins
Punnet Square: Practice
Roller - R
Non-roller -r
Mom
D
a
d
Punnet Squares
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Punnet Square: Practice
Blonde/Red hair - b
Brown hair - B
Dad
TONIGHT... You need to collect data about your
parents on the traits on the sheet provided to you.
Mom
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Investigation
"Inheritance of Human Characteristics"
Steps:
1) Use the data you collect about your parents AND the Punnet squares
sheet to display your data.
2) Use the information from your parents to create a Punnet square for
each trait.
NOTE: If you received the trait from BOTH parents... your parents
are
Dom/Dom
One could be... Dom/Res
3) Complete the Analyze questions (Pg. 41 #1, 4 & 6) on a separate sheet
of paper, and attach it to you punnet square sheet.
4) Hand in when finished... Or complete for homework.
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NATURE VS NURTURE
- Not all characteristics are inherited some depend on the
environment.
Eg. Scars, hairstyles etc.
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- some characteristics are due to a combination of factors
Eg. environment, weight
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- balance between environment (nurture) and genetics (nature) is
not well understood.
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MUTATIONS
Bill Nye - Genetics 45:00mins
Mutations interactive
- genetic information can be changed by factors in the
environment and random errors
- changes in genetic information is called mutations
- mutations can cause changes to structure of an organism
- x-rays, ultra-violet rays are mutagens because they cause
mutations.
September 23, 2015
Topic 4 REVIEW
We will complete Topic 4 Review as a ...