Law of Independent Assortment

Different traits are inherited independent of one another (during meiosis).

Law of Segregation

Genes that occur in pairs are seperated during gamete formation(meiosis) and recombine during fertilization

Law of Dominance

When an organism is hybrid (heterozygous) for a pair of contrasting traits, only the dominant trait can be seen. Ex. Tt-Tall

In humans, traits such as the ability to roll your tongue, a widow's peak hairline and free earlobes are just a few examples of dominant traits.

Other organisms such as plants and animals also have dominant traits.

African Honey Bees Public Enemy Number 1

African honey bees are genetically dominant over European honey bees!

http://www.teachertube.com/view_video.php?viewkey=9cf1a2c74eed3ce23db5

What did Mendel learn from his pea plant experiments?

Mendel began to breed different pea plants together and record his findings. He made many observations about the various traits he saw. For example, he discovered that when he crossed pure homozygous Tall plants (TT) with short plants (tt) all of the offspring were heterozygous Tall (Tt).

TT x tt=Tt

He defined dominant traits as those that were expressed, "the ones we can see". Indicated by a capital letter. In this example T=Tall.

Recessive traits are not expressed or masked. Indicated by a lower case letter. In this example t=short.

Now really have some fun with Mendel!!!!!

Visit this site and plant your own garden. See if you can tell what type of pea plants you will grow. If you have trouble starting the lab scroll down to the directory and start there.

http://www2.edc.org/weblabs/mendel/mendelInstructions.html

Who started the whole thing ?

Gregor Johann Mendel (1822-1884)- "the Father of Genetics".

Johann Mendel was born on July 22, 1822 in Heizendorf, Austria. His family were poor farmers.To obtain an education Johann entered a monastery. St. Thomas was located at Brunn in Moravis (which is now known as the Czech Republic). It was in the gardens of the monastery where he began his famous study of pea plants and their inheritance.


Mendel's research resulted in the" Laws of Genetics."

1. Law of Dominance.
2. Law of Segregation.
3. Law of Independent Assortment.

Images from:

Gregor Mendel in 1865 (David Paterson)

Vt stateparks.com

"Thread of Life" -Mendel's Gene Theory Explained."

Why pick Genetics on Geri's Corner?

Have you ever found topics in genetics fascinating, but you don't think of yourself as a scientific wizard? Well here's the place to visit. My name is Geri and I have created a little corner of the earth for us to discuss topics in genetics without making the subject too complicated. Read up, connect to my links and learn how to enjoy various topics in genetics.

What is genetics?

Genetics is a branch of biology which studies the way hereditary information is passed from parents to offspring.