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TLS Online TPP Program

#Question id: 7191

In tunicate embryo, Presumptive endoderm originates from the vegetal A4.1 and B4.1 blastomeres. The specification of these cells coincides with the localization of β-catenin. Which of the following statement is incorrect?

#Unit 5. Developmental Biology
  1. Inhibition of β-catenin results in the loss of endoderm and its replacement by ectoderm in the tunicate embryo.
  2. increasing β-catenin synthesis causes an increase in the endoderm at the expense of the ectoderm (just as in sea urchins).
  3. The β-catenin transcription factor appears to function by activating the synthesis of the homeobox transcription factor Lhx3. Inhibition of the lhx3 message prohibits differentiation of endoderm.
  4. During the differentiation of endoderm β-catenin inhibits the synthesis of Lhx3. Expression of Lhx3 message causes differentiation of ectoderm.
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TLS Online TPP Program

#Question id: 3311

#Unit 11. Evolution and Behavior

Consider a diploid population at Hardy-Weinberg equilibrium. For a locus with two alleles, the frequency of the A1A1 genotype is 0.01) The frequency of A2A2 is
TLS Online TPP Program

#Question id: 3312

#Unit 11. Evolution and Behavior

Hardy-Weinberg equilibrium, the frequencies of the two alleles A1 and A2 is 0.4 and 0.6. When you consider A2 is dominant allele of genetic disorder. The frequency of defected individuals, in population size 1000 is
TLS Online TPP Program

#Question id: 3313

#Unit 11. Evolution and Behavior

Which one of the following statement is incorrect for the process of speciation?
TLS Online TPP Program

#Question id: 3314

#Unit 11. Evolution and Behavior

The body weight of offspring of bird species is range between 12 gm to 18 gm. In a laboratory experiment, species was subjected to selection pressure having influence on the offspring body weight. After many generations of experimental selection pressure, the body weight range between 14 gm to 16 gm. Which of the following natural selection operate on this species?
TLS Online TPP Program

#Question id: 3315

#Unit 11. Evolution and Behavior

Which one of the following statements is TRUE for Negative-frequency dependent selection?
TLS Online TPP Program

#Question id: 3316

#Unit 11. Evolution and Behavior

There are two population A (N = 500) and B (N=50). Due to genetic drift, both populations will lose its genetic diversity in a generation. Such losses become magnified over many generations. After 20 generations, what will be lose its original variation?