The human genome is made of 3.2 billion bases of DNA but other organisms have
different genome sizes.
Not exact matches
The nonredundant protein sets of flies and worms are similar in
size and are only twice that of yeast, but
different gene families are expanded in each
genome, and the multidomain proteins and signaling pathways of the fly and worm are far more complex than those of yeast.
Previous research had shown that
genome sizes vary widely across
different species of insects or plants, a telltale sign of fluctuation.
The results of this matching exercise are astoundingly data - rich maps — they look like quilts of nested, color - coded squares of
different sizes — that specify the likelihood of any two segments of a chromosome (or even two segments of an entire
genome) to be physically close to one another in the nucleus.
Although the
genomes of many groups have undergone duplications thought to make possible their diversification into
different shapes and
sizes, the researchers found no such expansion in the coffee group.
Current Predictions of Approximate Gene Number and
Genome Size in Organisms in
Different Evolutionary Lineages.
«Even though a microbial
genome is one - thousandth the
size of the human
genome, the total number of microbial genes in [the human] body is much greater than human genes because you have so many
different species,» says Weinstock.
Plant stomata decrease in both
size and number in what seems to be a intrinsic functional adaptation that persists in the plant
genome through epochs of
different background carbon concentrations.