A) Bt toxin gene
B) barnase gene
C) lectin gene
D) chitinase gene
Correct Answer: B
Solution :
Genetic engineered male sterile crop plants are obtained by inserting barnase gene in front of promoter of plant gene that has tapetum specific expression. Barnase protein expressed is a extracellular RNase that degenerates tapetum in Pollen Mother Cells (PMCs) making them sterile.
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