Q10 of 30 Page 1

State one advantage and one disadvantage of cleistogamy.

Cleistogamy is a type of self-pollination of certain plants that can propagate by using non-opening, self-pollinating flowers.

Advantage: Production of assured seed-set even in the absence of pollinators.


Disadvantage: Least variation is observed as the progeny is a result of self-fertilization.


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(a) A recombinant vector with a gene of interest inserted within the gene of α-galactosidase enzyme, is introduced into a bacterium. Explain the method that would help in selection of recombinant colonies from non-recombinant ones.

(b) Why is this method of selection referred to as “insertional inactivation”?