Parental, F1, F2 Generation

In the following interpretation, we consider autosomal localization of genes , monogenic inheritance of the trait and complete dominance and recessivity .

Parental generation

Monohybridism

The parental generation (parental generation) in the hybridization experiment must always be homozygous for the gene/trait under investigation . In the case of monohybridism , this means that if, for example, males are dominant AA homozygotes in the gene under study, then females must be recessive aa homozygotes .

 For more information see Monohybridismus.

Dihybridism

When monitoring two genes simultaneously (dihybridism), the genotype of the parental generation entering the hybridization trial can be:

  1. AABB x aabb
  2. AAbb x aaBB

Trihybridism

With simultaneous monitoring of three genes (trihybridism), the genotype of the parental generation entering the hybridization experiment can be:

  1. AABBCC x aabbcc
  2. AAbbCC x aaBBcc
  3. AABBcc x aabbCC
  4. aaBBCC x AAbbcc

F1 generation

Genotypes of P, F1 and F2 generations in monohybridism
Genotypes of P, F1 and F2 generations in monohybridism

Gametes carry a reduced (haploid) number of chromosomes ; their fusion creates the F1 generation (first filial generation - first generation of offspring). The F1 generation is always uniform; these are heterozygotes in all monitored loci :

  1. monohybridism – genotype Aa
  2. dihybridism – genotype AaBb
  3. trihybridism – AaBbCc

F2 generation