In Transversion (Substitution Gene Mutation), we say that purine is replaced by pyrimidine.
So my doubt is, is adenine replaced by both thymine or cytosine or by thymine only?
Similarly, is guanine replaced by both thymine or cytosine or by cytosine only?
adenine is replaced only by thymine not by cytosine and guanine is replaced only by cytosine
I have a doubt that why cork cells are dead and are they dead from beginning of their life or afterwards ?
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