Ranjan, PrabhatDesai, KundanbalaSaxena, Shailaja Gada2013-11-202013-11-202013-04Ranjan Prabhat, Desai Kundanbala, Saxena Shailaja Gada. Derivative chromosome 11 in a child resulting from a complex rearrangement involving chromosomes 3, 6 and 11 in father: Significance of parental karyotyping. Indian Journal of Human Genetics. 2013 Apr; 19(2): 262-265.http://imsear.searo.who.int/handle/123456789/149439The presence of derivative chromosome in a child with phenotypic features necessitates the need of parental karyotyping to ascertain the exact amount of loss or gain of the genetic material. The aim of this study was to emphasize the importance of parental karyotyping. Cytogenetic evaluation of the proband and his father were carried out at Laboratory. Cytogenetic analysis was performed on phytohemagglutinin stimulated cultures. The derivative chromosome 11 in proband was ascertained to have additional material from chromosome 6p arising from complex chromosomal rearrangement in the father. Karyotyping is the basic, cost-effective preliminary investigation in a child with mental subnormality or congenital anomalies.enBalanced translocationscomplex chromosomal rearrangementderivative chromosomegenetic counselingintellectual disabilitykaryotypingChromosome Segregation --geneticsAdultChild, PreschoolChromosomes, Human, Pair 3 --geneticsChromosomes, Human, Pair 6 --geneticsChromosomes, Human, Pair 11 --geneticsGenetic CounselingHumansIntellectual Disability --diagnosisIntellectual Disability --epidemiologyIntellectual Disability --geneticsKarotyping --methodsMaleTranslocation, GeneticArticle