Science 4 Kids science4kids7.gif (5060 bytes)logobook4.GIF (2735 bytes)

"Science and Biotechnology Books Made Simple"


About Us



What's New

Fun Stuff


Contact Us


Order Now

















na01441_1.wmf (13502 bytes)

Case No 3  The Pea Plant

Gregor Mendel, a monk known as the 'Father of Genetics', liked to experiment with pea plants. He first pollinated garden peas that were identical (tall).   The offspring were all tall. He then pollinated garden peas that were not identical. One pea plant was tall, and the other was short.

Mendel found that all the offspring were again tall.  

From the above experiment, what did Mendel conclude about the trait (known also in genetics as phenotype) tall?

Hint: When one trait dominates the other, it is referred as dominant. When the trait does not dominate, it is referred as recessive.

bulletIt is dominant
bulletIt is recessive


Each plant carries two copies of a hereditary component. They are referred to as alleles. One allele comes from one parent, the other from the other parent.  Alleles pass into different reproductive cells, called gametes.

When an allele is dominant, a capital letter is given to it. In this case, a T is for tall. When the allele is recessive, a lowercase letter is given to the trait (t for short). 

Now, with the above information, what are the results of the offspring, if one parent is TT (tall) and the other is tt (short)?


Note: When both parents contribute identical alleles for a trait to an offspring (TT or tt), the offspring is homozygous for that trait; while parents contributing different alleles to an offspring (Tt), the offspring is said to be heterozygous for that trait. The genetic composition (such as TT, tt or Tt) of an offspring is known as Genotype.



 Top of Page  j0247695.wmf (422 bytes)


Send mail to  with questions or comments about this website.
 Copyright © 1999-2011, Science2Discover. All rights reserved. Science2Discover® is a trademark of Science2Discover.