Practice question

Non-recurrent apomixis rare phenomenon where meiosis proceeds normally producing haploid megaspores, but embryo develops from haploid egg without fertilization through haploid parthenogenesis. Resulting embryo possesses n chromosome number, hemizygous for all genes, exposing recessive lethals and causing severely reduced vigor, frequent albinism and complete male and female sterility because meiosis in haploid sporophyte unable to produce balanced gametes due to absence of homologous pairing leading to random chromosome segregation. Often accompanied by absent or defective endosperm causing seed abortion. Sporadic occurrence reported in Solanum nigrum, Lilium and Nicotiana under stress. Because haploid embryo not fertile, reproduction does not repeat clonally over generations, explaining non-recurrent designation distinguishing from stable diploid recurrent pathway that underpins agricultural use of apomixis. This understanding supports competitive exam preparation for NEET, GATE and CSIR NET concepts linking genotype with phenotype through molecular pathways involving transcription factors, hormones and metabolic enzymes that regulate development, adaptation and reproductive biology in applied breeding programs.