The document discusses key concepts in genetics and DNA structure including: - DNA stores and transmits genetic information through repeating sequences of nucleotides. - Genetic information is organized into chromosomes, the complete set of DNA in an organism is called the genome. - Chromatin is condensed or uncondensed DNA combined with proteins. The locus specifies the position of a gene on a chromosome and alleles are gene variants at a locus.

1. Dr.R.Rajprasath,
Junior resident,JIPMER
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2.  DNA & structure
 Gene & Genome
 Chromosomes
 Chromatin & Chromatids
 Locus & Allele
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3.  nucleic acid-stores & transmits genetic information
 Repeating sequences of nucleotides
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8.  Unit of genetic information encoded by DNA
 Organised into a number of rod shaped organelle
called CHROMOSOMES.
 GENOME : complete sets DNA of an organism
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9.  Condensed DNA + histone+ non histone proteins
 Chromatin: uncondensed DNA+ histone+ non
histone proteins
 Euchromatin : active
 Heterochromatin : inactive
 Chromatid : cell division- replica of chromosome
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12.  locus-precise position of gene in a chromosome
 Allele- pair of genes in same locus in homologous
chromosomes
homozygous heterozygous
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15. Gene,loci,
chromosome
??!! DNA,allele…
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16. Have a brake..
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