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I can define a trait.
I can give examples
of traits.
I can define a gene.
I can explain
Mendel’s role in
Genetics.
I can define
Genetics.
I can define Heredity.
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I can identify the P
generation.
I can identify the F1
generation.
I can identify the F2
generation.
I can define an allele.
I can describe a
dominant allele.
I can describe a
recessive allele.
Trait
 Gene
 Gregor Mendel
 Heredity
 Genetics
 P Generation
 F1 Generation
 F2 Generation
 Allele
 Dominant
 Recessive

All those characteristics
you just listed are called
traits.
A trait is a characteristic
that an organism can
pass on to its offspring
through its genes.

Not Traits
›
›
›
›

Traits
›
›
›
›
›
›
Number of arms
Number of legs
Skin color
Eye color
Hair color
Straight/crooked
teeth
Reading
Writing
Riding a bike
Doing a cartwheel
› Nobody comes out
of mom doing any
of these!

Genes….
Remember those
sections of DNA that
we would copy into
mRNA in Protein
Synthesis?
› Those sections of
Not jeans.
DNA are called
genes!
If your mom had brown eyes and your
dad had blue eyes (like our very serious
models are showing below), what color
will your eyes be?

To solve this problem, we need to travel
back to the 1800s where Gregor Mendel
was growing pea plants…
Call me Greg
Mendel was a priest in Europe
 He grew pea plants

› He began studying those plants when he noticed certain
traits would appear and disappear


This is heredity – the passing of physical
characteristics from parents to offspring
Mendel is known as the Father of Genetics
› Genetics – the scientific study of heredity

Mendel would test for one trait at a time. For
example, he would cross a yellow pod plant
with a green pod plant. He would then see
what the offsprings’ pod color would be.


The plants that he crossed are called the P1
generation (the parent generation)
The plants that came out of the cross are called
the F1 generation.

Mendel then crossed
an F1 plant with
another F1 plant. The
plants that came out
of this cross are called
the F2 generation.

Dominant Allele
› A dominant allele
will always show up
› In pea plant pods,
green is dominant

Recessive Allele
› A recessive allele
will only show up if
there is not a
dominant allele
present
› In pea plant pods,
yellow is recessive
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https://med.stanford.edu/news/all-news/2014/06/vast-genetic-diversity-among-mexicans-found-in-large-scalestudy/_jcr_content/main/image.img.620.high.jpg
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