Difference between F1 and F2 generation.Explain …

F1 is the generation produced by cross pollination of one character such as height at a time whereas F2 generation is produced by self pollinating the plants obtained in F1 generation. Recessive traits : The traits which cannot express itself over contrasting traits is called a recessive trait. For example Shortness in F1 generation. Dominant trait: The trait which can express itself over other contrasting traits is dominant trait. For example Tallness

F1 (also called first filial generation) are offspring produced by crossing traits of parents and F2 (also called second filial generation) are offspring produced by crossing of traits of offspring produced in F1 generation. 

Dominant trait: The trait which can express its effect over contrasting trait is called a dominant trait. It is expressed even in the presence of one copy of an allele for a particular character in the gene, i.e., it is expressed in the heterozygous condition.

Example: Yy represents dominant trait for yellow seed colour. Seed is yellow even when single copy is dominant allele Y is present.

Recessive trait: The trait which cannot express its effect over contrasting trait or which gets suppressed by the contrasting trait is called a recessive trait. It is expressed only when two copies of an allele for a particular character in the gene are present, i.e., it is expressed in the homozygous condition and in the absence of corresponding dominant trait.

Example: yy shows recessive trait for green seed colour. It is expressed only when two copies of recessive allele yy is present.