13. Which of the following is (are) involved in post-translationa ation of eukar

Question

13. Which of the following is (are) involved in post-translationa ation of eukaryotic gene expression? a. Altenative splicing. b. Enhancers d. Phosphorylation. e Transposons 14. Which of the following is a false statement? a Organisms exist as individuals b. Selection acts on individuals c Individuals evolve d. Populations evolve e. In populations that reproduce sexually, individuals are not identical 15. In order to be selected for optimum values, new mutations must a Retain prevailing adaptive features b. Facilitate the origin of new features c. Eliminate all previous adaptive features d a and b. e b and c 16. When two difterent genes control the same aspect of the phenotype in the same way, the situation is referred to as a. Pseudogenetics b. Neofunctionalization c. Subfunctionalization d. Redundancy e Parallelism 17. "Hot spots of mutation" are a. Regions of the genome that are not affected by mutations. b. Regions of the genome with the lowest mutation rates c. Regions of the genome with the highest mutation rates. d. Any regions of the genome with point mutation. e. None of the above 18. Which of the following might favor the accumulation of genetic polymorphism within a population? a. Neutral mutations b. Deleterious dominant mutations. c. Deleterious recessive mutations d a and b. c. a and c 19. Which of the following describes a QTL? a. A region of the chromosome that affect a particular aspect of the phenotype. b. A region of the chromosome that affect a particular quantitative aspect of the phenotypse. c. A region of the chromosome that affect a particular qualitative aspect of the phenotype. d. A region of the chromosome that responds to environmental changes e. All of the above

Explanation / Answer

13. Operator and Enhancers are involved in post translational regulation of eukaryotic gene as Repressors bind to the Operator, coding sequences on the DNA strand while Enhancers are sites on the DNA helix that are bound by activators in order to loop the DNA bringing a specific promoter to the initiation complex.

14. The false statement is in the population that reproduce sexually are not identica but the fact that in case of humans identical twins are born that are bby the process of sexual reproduction. In this type of reproduction the mitosis of the zygote occurs after fertilisation.

15 The answer is option "d" i.e in order to be selecte the new mutation shoud be acclimatised to the environment as well as it should also be retained to the prevailing environment so that if any change occurs the mutation can be withold by the organism.

16. Subfunctionalization is a neutral mutation process in which each paralog retains a subset of its original ancestral function. The figure illustrates that the ancestral gene (orange & blue) is capable of both functions before gene duplication. Hence the answer is "c".

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