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Class XII problemIn F.Griffith's experiment, how did the non virulent strain of Streptococcus pneumoniae become virulent?

Answer»

When Frederick Griffith injected a mixture of heat KILLED S(virulent strain) and R(non virulent strain) BACTERIA, the mice died. Moreover, he recovered living S bacteria from the dead mice.
He concluded that the R strain bacteria had been transformed by the heat killed S strain bacteria. Some 'transforming principle', transferred from the heat-killed S strain, had enabled the R strain to SYNTHESIS a smooth polysaccharide coat and become virulent.
This is actually, due to the TRANSFER of the genetic MATERIAL (the transforming principle).


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