4 public questions tagged with this topic.
Mendel proposed the Law of Segregation, stating that alleles separate independently during gamete formation.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Mendel's Laws - Dominance Segregation Independent Assortment
Mendel's experiments succeeded largely because he selected traits showing discontinuous variation with clearly separable phenotypic classes controlled by single major genes. Pea characters like seed shape, flower colour and pod form segregated into discrete categories without intermediate blending, enabling counting and ratio calculation. Polygenic continuous traits would have produced overlapping distributions obscuring segregation, variable environment would increase noise, linked genes would distort independent assortment, focus on unlinked Mendelian discontinuous characters was key to discovering laws. This principle is routinely tested in NEET, CBSE 11-12, CUET, CSIR-NET, GATE and MSc Genetics examinations requiring clear conceptual distinction.
Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 2: Mendel's Success Discontinuous Traits
Mendel chose Pisum sativum, the garden pea, for his classic experiments because it offers easily distinguishable contrasting characters, self-fertilizing bisexual flowers allowing controlled pollination, short generation time, high seed yield and availability of true-breeding varieties. Seven characters he studied such as seed shape and flower colour exhibited discontinuous variation without environmental blending. Drosophila melanogaster, Zea mays and Arabidopsis thaliana emerged later as models for linkage and molecular genetics, but pea initially provided ideal simplicity revealing particulate inheritance. Mastery ensures accurate interpretation of monohybrid and dihybrid progeny arrays, distinguishing dominance interactions from epistasis or linkage effects.
Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 2: Mendel's Pea Model
Gregor Mendel is recognised as Father of genetics for pioneering systematic experiments on pea inheritance between 1856 and 1863 in Brno monastery. He applied quantitative analysis counting progeny phenotypes, deduced laws of segregation and independent assortment and proposed particulate factors maintained discrete across generations. While molecular biology, evolution and cytology have distinct founders like Watson and Crick, Darwin and Waldeyer, Mendel's methodological rigour founded transmission genetics, providing framework for breeding, genetic counselling and modern genomics that underpins NEET and CSIR syllabi. Conceptual clarity supports solving numerical problems involving segregation ratios, recombination frequencies and probability calculations in crosses.
Ref: Mendel 1866, Versuche über Pflanzenhybriden; Hartl, Genetics, Father of Genetics
