TLS Online TPP Program
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TLS Online TPP Program
#Question id: 11409
#Unit 10. Ecological Principles
Species characteristics that make them less prone to extinction are listed below:
A. Narrow niche and specialized
B. High dispersal power
C. High trophic status
D. Long life span
Which of the following is the correct combination?
TLS Online TPP Program
#Question id: 12749
#Unit 13. Methods in Biology
What are the constituents used for isolation of bacterial plasmid DNA, RNA and plant DNA respectively?
TLS Online TPP Program
#Question id: 4917
#Unit 8. Inheritance Biology
Cytoplasmic male sterility in maize is manifestation of interaction between
TLS Online TPP Program
#Question id: 15524
#Unit 4. Cell Communication and Cell Signaling
The bulk of DP thymocyte death (~95%) occurs among thymocytes that fail positive selection because
TLS Online TPP Program
#Question id: 12238
#Unit 10. Ecological Principles
The mussel Mytilus edulis thrives in saline habitats, in both the highly salty seawater of tidal zones and the less salty estuaries. This results in two kinds of populations: one adapted to the higher salt concentrations of the tidal zone, and one adapted to the lower salt concentrations of the estuary. It has been found that the more salt-tolerant populations have high frequencies of an allele that produces an enzyme involved in maintaining osmotic equilibrium. Conversely, estuarine mussels having the same enzyme seem to be disfavoured and have a much higher death rate than mussels without the allele. Adult estuarine populations do have lower frequencies of this allele. Each spring, large numbers of larvae from the salty habitats pour into the estuaries.
The invasion of the seawater larvae would be expected to facilitate change in the genetic structure of the estuarine population by a process called