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TLS Online TPP Program

#Question id: 2896

Different modification states of the residue Lys-9 on the tail of histone H3 could be interpreted to have different meanings. One example of how a histone modification can apparently influence a second modification present nearby is illustrated by the Drosophila HP1 protein. Which of the following statement is correct regarding this kind of epigenetic regulation?

#Unit 2. Cellular Organization

  1. During metaphase, the HP1 protein binds in high concentration to the mitotic chromosomes, as they retain the essential “mark—namely, histone H3 methylation of lysine 9 (H3K9).

  2. The dissociation of HP1 by the Aurora B kinase seems to be required for the attachment of the mitotic spindles to the centrosomes and the subsequent separation of sister chromatids during cytokinesis.

  3. After the completion of mitosis, the phosphorylation of serine 10 is still retained because of Aurora B kinase activity, and HP1 dissociates from the chromosome to maintain the euchromatin state of chromosomes.

  4. Loss of HP1 binding is associated with phosphorylation of the neighboring serine residue at position 10 of H3 which is mediated by a cell cycle kinase called Aurora B that becomes active only after the M phase of the cell cycle.

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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?
TLS Online TPP Program

#Question id: 3317

#Unit 11. Evolution and Behavior

Which of the following statements is NOT correct regarding effect of genetic drift?
TLS Online TPP Program

#Question id: 3318

#Unit 11. Evolution and Behavior

When members of a metal- torerant and metal sensitive species that initially occupied the same habitat within the same range diverge into two species due to starting to show a change in their flowering season. This process known as