How does terminator gene stops seed formation?
Three stretches of DNA, which carry genetic information, need to be introduced into the plant for the purpose of stopping seed formation. The first bit of DNA has a particular type of promoter, which is essentially a stretch of DNA where the process of converting a gene into a protein is initiated. promoter used for the `terminator gene’ becomes active only in the latestages of seed maturation. But if only this promoter and the lethal gene were inserted into plants, then even the first generation seeds wouldn’t sprout. This is prevented by having a `blocking sequence’ between the promoter and the lethal gene so that the latter is prevented from being expressed. The blocking sequence is itself flanked by excision sequences. The second bit of DNA carries the gene for an enzyme called recombinase which is able to recognise the excision sequences and remove these, alongwith the blocking sequence, from the first strip of DNA. The recombinase gene is kept in control by another type of promot
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