Salient features of human genome
(i) The human genome contains 3164.7
million nucleotide bases.
(ii) The average gene consists
of 30000 the largest know human gene being dystrophin at 2.4 Million bases.
(iii) The total number of genes
is estimated to be 30000 and 99.9% nucleotide bases are exactly the same in all
(iv) The functions are unknown
for over 50% of the discovered genes.
(v) Less than 2% of the genome
codes for proteins.
(vi) The human genome contains
large repeated sequences.
(vii) The repeated sequence is
thought to have no direct coding functions but they throw light on chromosome
structures, dynamics and evolution.
(viii) Chromosome I has most
genes (2968) and the Y has the fewest genes (231).
(ix) Scientists have identified
about 1.4 millionlocations where single base DNA sequence differences called
SNPs or Single Nucleotide Polymorphisms occur in humans.
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