Download Gregor Mendel

Genetics
Describe the research
of Gregor Mendel and
the principles that
resulted from his
research.
Gregor Mendel
Gregor Johann Mendel was born
on July 22, 1822, in Heizendorf,
Austria.
He was the only son of a peasant
farmer.
In 1843 he began studying at the
St. Thomas Monastery of the
Augustinian Order in Brünn.
He was ordained into the
priesthood and became a Monk in
August of 1847.
He died on January 6, 1884.
Mendel’s Research
He was in charge
of the monastery
garden.
He studied the
heredity of pea
plants.
Mendel’s Research
Pea plants go through
self-pollination.
This means that the pollen
(male sex cell) comes from the
same plant of the ovule (female sex
cell).
Mendel knew that the pea plants
were purebred (true breeding
plants).
Meaning that the offspring will always
have the same traits as the parent.
Mendel’s Research
Mendel produced seeds by
crossing two plants with
different varieties of a trait.
This produces a hybrid
A hybrid is an offspring
of parents with different
traits
Mendel’s results:
F1  one trait disappeared
F2  trait that disappeared
reappeared in 1:3 ratio.
Mendel’s Conclusions
He determined that biological
inheritance is determined by factors
that are passed from one generation
to another.
We now call these genes.
Each gene has two alleles
–Alleles are different forms of the
gene.
Mendel’s Conclusions
The Principle of Dominance
States that some alleles are dominant
and others are recessive.
Law of Segregation
Alleles separate from each other during
the formation of gametes (sex cells).
Independent Assortment
Genes for different traits can segregate
independently during the formation of
gametes.