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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
TLS Online TPP Program
#Question id: 5239
#Unit 8. Inheritance Biology
Which of the following statements is not true for Hfr strains of E. coli ?
TLS Online TPP Program
#Question id: 7137
#Unit 5. Developmental Biology
Which of the following correctly describes the sequence of events by which the position of limbs along the antero-posterior axis of vertebrates is specified?
TLS Online TPP Program
#Question id: 23240
#Unit 2. Cellular Organization
Mycoplasma’s plasma membrane contains ________ which protect them from lysis.
TLS Online TPP Program
#Question id: 8841
#Unit 9. Diversity of Life Forms
Adaptive radiations can be a direct consequence of four of the following five factors. Select the exception.