Practice question

Mendelian inheritance applies principally to nuclear genes located on chromosomes within nucleus that undergo mitotic replication, meiotic segregation and fertilisation restoration. These genes exhibit predictable segregation 1:1 gametic and 3:1 phenotypic ratios, linkage and recombination. Cytoplasmic, mitochondrial and plastid genomes replicate autonomously, segregate through cytoplasmic division, typically maternal inheritance and vegetative segregation lacking Mendelian ratios. Thus Mendelian principles govern majority of trait inheritance in eukaryotes, distinguishing nuclear from organellar genetic systems. Conceptual clarity supports solving numerical problems involving segregation ratios, recombination frequencies and probability calculations in crosses.