When an mRNA attaches to the small ribosomal subunit in bacteria, translation of the mRNA starts close to the 5' end of the mRNA molecule.
As soon as mRNA is transcribed in bacteria, it is translated into protein. In contrast to eukaryotic cells, bacteria lack a distinct nucleus that divides DNA from ribosomes, removing a barrier to translation. Transcription and translation take place concurrently in these species. mRNA translation initiation in bacteria begins as soon as the messenger RNA (mRNA) molecule's 5' end has been created. Transcription and translation are interdependent processes that take place in these prokaryotic species. A short ribosomal-binding region that is located near the mRNA's 5' end helps bacterial mRNA bind to the small ribosomal subunit at the beginning stages of translation.
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According to the question, mating between two populations of Rhagoletis produce hybrid flies.
This means that the two population is present in the same habitat or locality, hence they are capable of coming in contact with each other and mate. Hence, the answer cannot be Habitat Isolation.
Mating produces hybrid flies. This is possible when the gametes (egg and sperm) of the two different populations are capable of capable of coming close to each other and undergoing fusion (fertilization). Hence, there is no Mechanical Isolation.
The zygote formed by the above fertilization is capable of developing into healthy hybrid flies with normal life span. Hence, Pre-zygotic Isolation is absent.
But the hybrid flies formed are sterile and not fertile, that is, they are incapable of producing viable gametes which can undergo fertilization and produce a new offspring.Therefore, the eggs laid by the hybrid flies hatch less often. Hence, there is existence of Reduced hybrid fertility.
