Download Biology 4/3/17 - Liberty Union High School District

Biology 4/3/17
Do Now
Do in Class
Do at Home
Please pick up the
Genetics Wheel
handout and take
out your lab
notebook
Variations in us – genetic
wheel activity
Complete the notes up to the
question: What is Meiosis
and How does it Create
Variation? (Stop when you
get to this question)
Discuss then turn in
genetic wheel
A look back before
moving forward – Prezi
presentation; notes
You can access the
presentation from my
school web page. Just
click on Science Links and
choose the “A Look
Back…” link
Traits Table
Trait
1. Laugh dimples
2. Tongue roll
3. Crossing thumbs
4. Many freckles
Phenotype
“X”
Genotype
Dimples appear in cheeks while
smiling/laughing
L_
No dimples
ll
Can roll tongue into a “U” shape
T_
Cannot roll tongue
tt
Left thumb on top of clasped hands
C_
Right thumb on top of clasped hands
cc
Many freckles present on face
M_
No/very few freckles on face
mm
Traits Table Continued
Trait
5. Ear lobes
6. Widow’s peak
7. Blue eyes
Phenotype
“X”
Genotype
Detached ear lobe
E_
Attached ear lobe
ee
Peak in center of hairline
W_
No peak in center of hairline
ww
Any color besides blue
B_
Blue eyes
bb
Filling in the Genetic Wheel
Genotype?
L _ or ll
Genotype?
T _ or tt
Genetic Wheel Questions (answer on
the back of your wheel handout)
1. What is your Genetics Wheel number? Ask around. Does anyone else in class have your exact
number? If so, how many other people? If not, why don’t you think so?
2. If more genetic traits were included in the wheel, would it be more likely or less likely that
more people in class would share your number? Explain your answer.
3. Look at the Wheel. How does a person with combination 63 differ from someone with the
combination 61?
4. We all inherit traits that come from each of our parents. If you have a recessive trait, like
no/very few freckles, it means you inherited a recessive gene from each parent. If you have
many freckles, it means that you inherited AT LEAST one dominant gene. That means that
someone with many freckles COULD be FF or Ff since a dominant trait complete takes over,
even if that person inherits a recessive gene from one parent. On the wheel, we show this as D
_ since we do not know whether people with dominant traits are DD or Dd just by looking at
them. Do you think that all “dominant” traits are more common in a population of people?
Give an example. Hint: Do most people in the class have many freckles?