Neuron

 Neuron 

Respiratory system

 Respiratory system

living things consist with cell.

Allele

 The variant of nucleotide sequence of a DNA is called allele. 

Allele differs from each other in a single position nucleotide polymorphism. But it also can differ in thousand of base pair deletion and insertion.

Most of the allele differs among them in a results as phenotype change,  but not in gene coding.  For example, white and purple colour of pea plant flower is results of different allele,  but not in gene difference.

Laws of independent assortment

 Laws of independent assortment is an inheritance theory. It is known as the third law of inheritance.

According to laws of independent assortment different allele of different gene assorted independently during gamete formation. 

Laws of segregation

 How the property of ancestors pass through the offspring explained by laws of inheritance. This law is a combined law of three inheritance law, 

Law of dominance 

Law of segregation 

Laws of independent assortment 

Laws of segregation is the second law of inheritance.

According to laws of segregation, Each diploid individual will possess a pair of allele for a particular trait.  During reproduction each parents will pass only one allele randomly to diploid offspring.

In F1 generation only dominant allele will appeared and recessive allele is hidden. But in F2 generation both allele will expressed.

Laws of dominance

 Laws of dominance is one of the law of out of three laws of inheritance.

Three laws of inheritance is

Laws of dominance 

Laws of segregation 

Laws of independent assortment 

During crossing of two contrasting trait, only a one trait will be appeared and others will be suppressed. 

The appeared trait is dominant trait and other is ressesive trait. Though, both will be inherit,  but one will be hiden and another will be appeared. 

Dominance trait will suppress the ressesive trait.  

In monohybrid crossing,  in first generation monohybrid trait will be appeared. But,  in second generation both trait will be appeared at a ratio of 3:1.