TLS Online TPP Program

#Question id: 6987


Which of the following statements about axon-guidance is TRUE?

#Unit 5. Developmental Biology
  1. Netrins are long-range cues for chemorepulsion
  2. Semaphorins are short-range cues for chemorepulsion
  3. Cadherins are short-range cues for contact attraction
  4. Ephrins are short-range cues for contact attraction
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TLS Online TPP Program

#Question id: 3426

#Unit 9. Evolution & Diversity of Life Forms

Fitness of three different genotypes is given in population I and II, under natural selection which of the following statement are correct?

TLS Online TPP Program

#Question id: 3427

#Unit 9. Evolution & Diversity of Life Forms

Natural selection can alter the frequency of distribution allele and heritable trait in different following way

A- Accumulation of those mutation that increase fitness of population in changing environment

B- Check accumulation of mutation that lower the fitness of species in unchanging environment

c- occur when population is subjected to divergent selection

TLS Online TPP Program

#Question id: 3428

#Unit 9. Evolution & Diversity of Life Forms

In a sample from an African population, the frequency of blood group allele IA, IB and IO were 0.30, 0.20 and 0.50 respectively. What is expected frequency of A and B blood group respectively when population size 1000?

TLS Online TPP Program

#Question id: 3429

#Unit 9. Evolution & Diversity of Life Forms

Which of the following is a behavioral pattern that results from a proximate cause?

TLS Online TPP Program

#Question id: 3430

#Unit 9. Evolution & Diversity of Life Forms

The proximate causes of behavior are interactions with the environment, but behavior is ultimately shaped by

TLS Online TPP Program

#Question id: 3431

#Unit 9. Evolution & Diversity of Life Forms

In the territorial behavior of the stickleback fish, the red belly of one male elicits attack from another male by functioning as