Mystery behind different eye colors and patterns

Each human being has different eye color - some have brown eyes, some have black, green or blue eyes.  What is the mystery behind different eye colors - black, brown, blue or green? What defines unique pattern seen in our eyes? Why eye color and pattern of one person differs from another? Are our genes responsible for eye color? Is eye color inheritable from parent to offspring?

Let's explore further to find out answers to the above questions.

Mendel's Law of Segregation or Law of Purity of Gametes

Law of Segregation is the second Law of Inheritance given by Mendel which was formulated based on the observations noted down while performing Monohybrid cross. 

When self-hybridization of F1 progeny is performed, we could see that in F2 generation, the phenotypic ratio is obtained as 3 : 1 (Tall : Dwarf) whereas genotypic ratio is obtained as 1 : 2 : 1 (Pure tall : Hybrid tall : Pure recessive).

Thus, we could observe that the recessive character which disappeared in F1 generation, reappears in F2 generation and shows that alleles or genes do not mix with one another and separated pure during gamete formation which is Law of Segregation or Law of Purity of Gametes.

Types of Immunity - Innate and Adaptive Immunity

Have you ever wondered:

• How does our body overcomes common cold on its own?
• Why humans do not get infected by plant diseases? 
• Why after getting vaccinated, our body becomes immune to that specific disease such as polio?

The answer to the above questions lies in the fact that our body has a defense mechanism called as IMMUNE SYSTEM which recognizes the foreign pathogens, fights against them and destroys them. 

In this article we will discuss about the different types of immunity.