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BIOLOGY DEFINITON LIST ICSE (all definitions)

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Dhruba Das
Bishop Cotton Boys' School (BCBS), Bangalore
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Slno Term 1 chromosomes- Definition Highly coiled chromatin fibres Misc // 2 Chromatin fibres network of very long extremely thin dark staining fibres // 3 Nucleotide Each single DNA strand is composed of nucleotide 4 Genetics The transmission of body features (both similarities and differences) from parents to offsprings and the laws relating to such transmission Is the technique in which the genetic constitution of an organism(bacterium) is altered by introducing new genes into its 5 genetic engineering chromosomes GMO insulin 6 Genes genes are the specific parts(DNA segments) of a chromosome, which determine the hereditary characteristics Mitosis(equational 7 division) The kind of cell division which occours in all body cells except egg producing oocytes and sperm producing spermatocytes, is known as mitosis 8 Meiosis Is the kind of cell division that produces the sex cells or gamates which are haploid(n). It takes place in the reproductive organs(egg producing oocytes and sperm producing spermatocytes) 9 Karyokinesis All nuclear changes that occur during cell division are collectively temed as karyokinesis 10 Heredity The transmission of genetically based characteristics from parents to offsprings Homologus 11 chromosome A pair of corresponding chromosomes, of same shape and size, one from each parent 12 Genome The full complement of DNA(including all genes and intergenic regions) of an organism 13 Alleles Alternative form of a gene occouping the same position(locus) on homologus chromosomes and affecting the same characterisics but in different ways is called allele 14 Genotype The set of genes present in the cells of an organism Is one in which the parent cell divides into 2 identical daughter cells, where the same normal chromosome number is maintained, at each cell division producing diploid(2n) cells

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