Short Answer TypeWhy do lepidopterans die when they feed on Bt cotton plant? Explain how does it happen.
Bt cotton plants are the transgenic plants that express a Bacillus thuringiensis gene called cry gene. This gene, encodes for protein crystals having insecticidal properties against insects of group Lepidoptera, Diptera and Coleoptera. Inside the bacterium, these proteins remain inactive and does not harm the bacteria. However, these inactive crystals can get activated in the alkaline pH of the gut of insects upon ingestion. After activation, these crystals can bind to the receptors present on the membranes of gut epithelial cells. Due to this binding, the membrane swells and pores are created on them. These pores lead to bursting of cell. Hence, soon the lepidopteran die due to starvation.
Multiple Choice QuestionsWhich of the following is not required for any of the techniques of DNA fingerprinting available at present?
Zinc finger analysis
Restriction enzymes
DNA-DNA hybridization
DNA-DNA hybridization
Which part of the tobacco plant is infected by Meloidogyne incognitia?
Leaf
Stem
Root
Root
Golden rice is a genetically modified crop plant where the incorporated gene i's meant for
Vitamin B
Vitamin C
Omega 3
Omega 3
A pleiotropic gene
is expressed only in primitive plants.
is a gene evolved during Pliocene
controls a trait only in combination with another gene
controls a trait only in combination with another gene
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