Which of the following statement is correct

a.Methylation of H3K9 demarcates heterochromatin 

b.H3K4 methylation demarcates heterochromatin 

c.H3K4 methylation demarcates euchromatin

d.Methylation of H3K9 demarcates euchromatin

TLS Online TPP Program

#Question id: 12795

#Unit 10. Ecological Principles

Two plant species live in the same biome but on different continents. Although the two species are not at all closely related, they may appear quite similar as a result of

TLS Online TPP Program

#Question id: 15152

#Unit 8. Inheritance Biology

In this problem we will explore some of the many ways that mutations in two different genes can interact to produce different Mendelian ratios. Consider a hypothetical insect species that has red eyes. Imagine mutations in two different unlinked genes that can, in certain combinations, block the formation of red eye pigment yielding mutants with white eyes. In principle, there are two different possible arrangements for two biochemical steps responsible for the formation of red eye pigment. The two genes might act in series such that a mutation in either gene would block the formation of red pigment. Alternatively, the two genes could act in parallel such that mutations in both genes would be required to block the formation of red pigment.

Further complexity arises from the possibility that mutations in either gene that lead to a block in enzymatic activity could be either dominant or recessive. If the crosses is made between a wild type insect with red eyes and a true breeding white eyed strain with mutations in both genes. Such considerations yield the Pathways in series with dominant mutations in both genes, determine the phenotype of the F1 progeny and the expected phenotypic ratio of red to white eyed insects in the F2.

TLS Online TPP Program

#Question id: 2724

#Unit 2. Cellular Organization

When DNA is compacted by histones into 10 nm and 30 nm fibers, the DNA is unable to interact with proteins required for gene expression. Therefore, to allow for these proteins to act, the chromatin must constantly alter its structure. Which processes contribute to this dynamic activity?

TLS Online TPP Program

#Question id: 2971

#Unit 2. Cellular Organization

Which one of the following is the most appropriate match?

Events	Protein	Phases
A. Cohesins are loaded onto chromosomes	I. Mei-S332/Shugoshin	a. G1
B. Cohesins can dissociate from the DNA	II. Polo kinase and Aurora B kinase	b. G2
C. Prevents cohesin phosphorylation, and hence dissociation	III. Scc2-Scc4	c. S
D. Phosphorylation of cohesins	IV. Pds5-Wapl	d. M

TLS Online TPP Program

#Question id: 19271

#Unit 9. Diversity of Life Forms

All of the following cellular structures are functionally important in cells of the gametophytes of both angiosperms and gymnosperms, except