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Punnett Squares & Meiosis

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Science Teachers

on 7 January 2014

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Transcript of Punnett Squares & Meiosis

Punnett Squares & Meiosis
Here is a Chromosome
You have 23 pairs of these.
One from your
MOM
One from your
DAD
One from your
MOM

One from your
DAD

Each pair has the same genes.
FACE

SHAPE
FACE
SHAPE
Skin
Color
Skin
Color
During Meiosis, ONE chromosome from each chromosome pair is randomly chosen.
You either pass on the chromosome from your
MOM
or the one from your
DAD
.

Why is it random? Because, they line up randomly.
Then the copies pair up,
Face Shape
Face Shape
First they double:
Face Shape
Face Shape
AND then the homologous pairs pair up:
Face Shape
Face Shape
Face Shape
Face Shape
There are 2 options for how they can line up.
Face Shape
Face Shape
Face Shape
Face Shape
Face Shape
Face Shape
Face Shape
Face Shape
It's random!
When a couple has offspring, we can predict the genes their offspring can have using Punnett Squares.
Each person will pass on 1 chromosome from each of their 23 pairs. 1 from either their Mom or Dad.
New Mom
New Dad
Grandma
Grandpa
Grandma
Grandpa
Face Shape
Face Shape
Face Shape
Face Shape
Remember! The new mom can pass on her DADS genes!
AND the new dad can pass on his MOMS genes! Gender doesn't matter.
What are the options for their offspring for this SINGLE gene?
We need to know the alleles that represent the genes! Good thing we know all about phenotypes and genotypes and have already decoded their DNA/genes.
r
r
r
R
r
R
r
R
r
r
r
r
The End
While your cells are building you they read both instructions.
If there are dominant traits those will show while recessive traits are masked. If you have TWO recessive instructions, you show that.
Full transcript