Is there any relation between the size of genome, i.e. number of base pairs and the complexity of an organism?

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2 Answers

There is no relationship between the  picograms of DNA or the number of chromosomes and the size or the complexity of the organism.

The genome's size really tells us nothing about the contents. The number of chromosomes tells you nothing about the number of base pairs in each chromosome, the density of gene loci along the chromosome or the arrangment of genes and their regulatory sequences along the strand.  There can be a few chromosomes with densely packed gene loci or many chromosomes with widely spaced loci but the same basic content. Related species can have widely divergent amounts of DNA.

The highest number of chromosomes for a mammal is 47 pairs found in the small water-loving Crab-eating Rat (Ichthyomys pittieri) and again in the Aquatic Rat (Anotomys leander). The smallest number in a mammal is 3 pair in female muntjac deer (Muntiacus muntjak) while their males have 7 yet another closlely related Chinese muntjac (Muntiacus reevesi) has 23 pair in both sexes, just like humans.  However the Chinese muntjac has 2.7pg haploid nuclear DNA while humans have 3.5pg despite having the same number of chromosomes.

Genome size by chromosome count

Animal genome sizes in picograms/genome - stats_top

Muntjac genomes

by Level 2 User (700 points)
No mamacita no relation whatsoeva
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