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TLS Online TPP Program
#Question id: 11983
#Unit 10. Ecological Principles
Which of the following is a behavioral pattern resulting from an ultimate cause?
TLS Online TPP Program
#Question id: 17196
#Unit 7. System Physiology – Animal
What happens when the stressor remains during the GAS?
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: 15765
#Unit 5. Developmental Biology
What is symmetrical differentiation?
TLS Online TPP Program
#Question id: 5658
#Unit 5. Developmental Biology
Following events occur during fertilization in mammals.
A. sperm penetrates cumulus layer
B. sperm nucleus delivered into cytoplasm
C. sperm plasma membrane fuses with egg plasma membrane
D. calcium waves
E. enzymes released from acrosome on sperm head enable sperm to penetrate zona pellucida
F. transit through the cumulus or binding to zona pellucida elicits acrosomal reaction in sperm
G. egg completes meiosis and development is initiated
which of the following sequence is correct?