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TLS Online TPP Program

#Question id: 7186

In dictyostelium stalk and spore cell maturation depends on cAMP level. Which of the following statement is incorrect regarding to this process?

#Unit 5. Developmental Biology
  1. During spore formation, ACG localizes to the spore surface when the prespore vesicles fuse with the plasma membrane. The cAMP phosphodiesterase RegA also plays a crucial role in regulating intracellular cAMP levels.
  2. This process is mediated by socalled sensor histidine kinases/phosphatases which either phosphorylate or dephosphorylate themselves on a histidine residue when a signal molecule binds to their sensor domain.
  3. Ammonia inhibits the onset of fruiting body formation and stalk maturation, activates the histidine phosphatase activity of sensor histidine phophatase C (DhkC), resulting in RegA activation, hydrolysis of cAMP and inhibition of PKA activity.
  4. Spore differentiation factor 2 (SDF-2) activates the histidine phosphatase activity of DhkA (histidine phosphatase A), which results in the inactivation of RegA, the accumulation of cAMP and in PKA activation, which subsequently causes spore maturation.
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TLS Online TPP Program

#Question id: 3308

#Unit 11. Evolution and Behavior

Consider a single locus with 3 alleles which are at Hardy- Weinberg equilibrium. If the frequency of all homozygous genotypes is 0.54, what is the frequency of allele in population?
TLS Online TPP Program

#Question id: 3309

#Unit 11. Evolution and Behavior

In a given population, 128 out of every 400 people has a carrier for recessive allele b that caused cancer in homozygous condition,  Assuming the population is in Hardy- Weinberg equilibrium, which of the following is the expected frequency of allele B and b in population respectively?
TLS Online TPP Program

#Question id: 3310

#Unit 11. Evolution and Behavior

In Prey population of genotype A1A1(100), A1A2( 200) and A2A2( 100) present in island, when predator introduced this area results ¼ of A1A1 and ½ of A1A2 killed over time however, no genotype A2A2 kill. What will be frequency of A1 allele in the population?
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?