Labmonk quiz, NET Life Science,
#1. If the ratio of the number of non-synonymous to synonymous substitutions per site in protein coding gene is greater than one, it is an evidence of selection that is
#2. An animal was first maintained in a constant environ-mental condition for several days until a consistent biological rhythm (B) was established. The animal was then exposed to an experimental physical rhythm (E) which modulates the phase and period of B. However, upon withdrawal of E, the B gradually regained its pattern of pre-exposure condition. From these observations which one or more of the following should be the most logical inference? P. E is a Zeitgeber Q. E is a masking agent R. E causes entrainment of B S. B is a conditioned to E The correct answer is
#3. In an altruistic act, if a donor sacrifices ‘C’ offspring which helps the recipient to gain ‘B’ offspring and the donor is related to the recipient by a coefficient γ, under which condition would kin selection favour this altruistic trait?
#4. Using molecular clock, it was estimated that two species A and B must have diverged from their common ancestor about 9 × 106 years ago. If the rate of divergence per base pair is estimated to be 0.0015 per million years, what is the proportion of base pairs that differ between the two species now?
#5. The frequencies of alleles ‘A’ and ‘a’ in a population at Hardy-Weinberg equilibrium are 0.7 and 0.3 respectively. In a random sample of 250 individuals taken from the population, how many are expected to be heterozygous?
#6. Which of the following food crops has recently been genetically engineered to obtain edible vaccine to develop immunity against hepatitis B?
#7. The photoreceptor commonly involved in light entrainment of the biological clock in flies, moulds and plants is
#8. What will be the approximate effective population size in a panmictic population of 240 with 200 females and 40 polygamous males?
#9. Release of nutrients, oxidants or electron donors into the environment to stimulate naturally occurring microorganisms to degrade a contaminant, is referred to as
#10. The following geological eras mark the advent of important events in the history of earth–origin of terrestrial plants, origin of mammals, and breakup of the land mass Pangaea; P. early Cambrian Q. late Devonian R. late Cretaceous S. late Jurassic Identify the correct match of the events with the geological era.
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