Correns discovered Mendel’s work and propounded the whole work into two laws of heredity:
(i) The law of segregation or law of purity of gametes, and
(ii) The law of independent assortment.
1. The Law of Segregation:
In a heterozygote a character remains in contrast paired form which is known as allele. One of alleles remains in dominant form and the other in recessive form or vice versa. Dominant and recessive alleles are adhered together throughout the life without getting mixed with each other.
During gametogenesis these alleles segregate (separate) from each other with the result that one gamete receives dominant allele and the other recessive allele. After hybridization (m monohybrid cross) in F1 generation all plants look alike, but their gametes after uniting together in F2 generation give the phenotypic (morphological) ratio 3:1.
2. The Law of Independent Assortment:
The law of independent assortment states that the alleles segregate quite independently from each other during the formation of gametes i.e. gametogenesis. In F1 generation or dihybrid cross all the plants would be alike but in F2 generation the ratio of characters of plants was 9:3:3:1.
