Prabin Kalikote

The major causes of air pollution are:
        - The dust particles released into the air.
        - Production of greenhouse gasses.
        - Agricultural residues are burnt which cause air pollution.
        - Smokes from vehicles and factories or industries.
        - Deforestation & global warming.

The combination of air with unwanted and harmful substance that degrades the quality of air is called air pollution.
The main sources of air pollution are:
        - Natural sources.
        - Artificial sources.

The contamination of the environment due to mixing of harmful and unwanted substance which makes environment impure is called environment pollution.

a.    Write down the genotype and phenotype of mother.
        - Genotype: bb
        - Phenotype: Pure white
b.    What is the phenotypic and genotype ratio of black and white complexion in F₂generation.
        - Phenotype: 2:2 or 1:1
        - Genotype: 2:2 or 1:1

The structural differences that provide individuality to each member of a species is called variation. 
The factors that bring out genetic variation are:
        - Structural and functional differences of a gene.
        - Environmental factors like food, light, temperature, etc.

The significance of Mendelism are
        - Diseases resistant and high yielding varieties of plants and animals can be produced by application of Mendelism.
        - Hybrids with desired characteristics can be produced.
        - The genotypes and phenotypes likely to be produced in successive generations can be predicted before the cross is made.
        - Dominant...

Here,

Here,
        Bb is a black mice because B is dominant character and bb is a pure white mice.
        So,
                Total black mice (Bb) = 2
                And total white mice (bb) = 2
                So,    phenotype ratio = 2 : 2
                       ...