Alleles-Examples-Basic Genetics

Sunday, November 27, 2016


In genetics,alleles are different forms of the same trait.
Traits are characteristics that can be passed from one generation to another.
All of the followings would be examples of a trait.
  • Hair color 
  • Skin color 
  • Height 
  • Chin shape, 
  • Gender
A gene is a portion of DNA that contains the genetic code for a trait.
Genes are located on chromosomes. Here is a picture.

For each trait, you get half of the information from mom and half from dad.
As a result, you get different forms of the same trait. 
These different forms are alleles.
Gregor Mendel, who is considered the father of genetics studied 7 traits of pea plants.

Gregor Mendel Alleles

For example, the color of the flower can be white or purple.
The pea plant can be tall or short.
For all 7 traits, each trait has at least two different forms.
These would be examples of alleles.
Different forms of the same trait.
Look at this picture of eye color.

Eye color

The trait is eye color, and the alleles are the different colors.

One last example, the shape of the chin is the trait, and the allele would be if it is cleft chin 
or smooth chin.
Alleles types of chin
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