as Mendel’s Laws of Heredity . Law of Dominance: “When two homozygous individuals with one or more sets of contrasting characters are crossed, the characters that appear in the F hybrid are dominant and those that do not appear in F are recessive characters". Law of Segregation or Law of purity of gametes: “When a pair of contrasting factors are brought together in a F hybrid. The two factors of the allelic pair remain together without mixing and when gametes are formed, the two separate out, so that only one enters each gamete.” Law of independent assortment: “In case of inheritance o f two or more pairs of characters simultaneously, the R Y Pure breeding round, yellow seeds R R Y Y R r Y y × R r Y y Round, yellow seeds Self-pollinaƟon F Dihybrid (First generaƟon) R Y R Y r Y R y r y R y r Y r y R R Y Y R R Y y R r Y y r r Y y R r y y r r y y R r Y y R R y y R r y y R r Y Y R r Y Y r r Y Y r r Y y R R Y y R r Y y R r Y y r y Parents Gametes Pure breeding wrinkled, green seeds r r y y Round, Yellow - Round, Green - Wrinkled, Yellow - Wrinkled, Green - Phenotypic raƟo of F2 generaƟon - : : : Figure .
Dihybrid Cross Genetics factors or genes of one pair assort out independently of the other pair. ” More to Know T.H. Morgan was awarded Nobel Prize in for determining the role of chromosomes in heredity. .
Chromosomes, DNA and Genes The human body is made up of million cells. The nucleus of each cell contains thin thread like structures called chromosomes . The term ‘chromosomes’ was first coined by Waldeyer in . The chromosomes are the carrier of genetic material which