Introns are deleted before a gene is transcribed from DNA to mRNA?

Introns are deleted before a gene is transcribed from DNA to RNA because introns are non coding regions between exons their presence will interrupt the translation process.

Explanation:

Introns are the non coding regions on mRNA that are transcribed from a sequence of DNA. The introns are deleted by  RNA splicing and only exons are coded so that correct protein is formed otherwise introns would get coded along and wrong protein will be formed. Introns are present in eukaryotic cell.

Introns play a very important role in controlling gene expression. Multiple variant of a particular protein is controlled by introns. An error during splicing would cause a different protein to be code.

Introns are important because all the cells in eukaryotes have same group of genes and to prevent them in getting expressed in all the cells where they are not required.

from almost the creation of the first true maps of the earth, people started seeing how continents would be able to fit together.   in particular, people noticed that south america fits almost exactly into africa.

you should be aware that while world maps were around early in the 1600’s and better defined by the end of the 1700’s, those maps were not ‘public’ but were treated as state secrets.   and so it was not till much later that the broader ‘science’ community had access to good quality and accurate world maps.

get the whole story here…

it is now known that most of the major continental masses can be fit together in a jigsaw process.   in fact we now know that the continents were indeed once all joined together as one land mass – the supercontinent of pangaea.

if you look at most world maps you will ponder how this is evidence, as the continents really don’t appear to ‘fit’ together very well.   what you need to understand is that the vast majority of maps are drawn using a map projection that has the north and south poles (which are points) are a line the width of the map at the top and bottom.   this means that the map distorts the true shape of the earth’s land and oceans as you love closer to the poles.     some other map projections distort less, but have the map shape looking like segments of an orange.   see here for a range of map projections.   check out the way greenland changes size in each!

what is more remarkable, is the next piece of evidence when added to the shape of continents.

location of mountains and fossils

what is remarkable, when you reassemble all the continents together, the ancient mountain ranges (many now eroded to their cores) and the location of rock types and fossils all match up.

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b