Parental, F1, F2 Generation

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

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.

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
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

Related articles

 * Allelic interactions
 * Genotype
 * Phenotype
 * Monohybridism
 * Dihybridism
 * Backcrossing