DNA methylation occurs at cytosines of CpG islands, leads to repression of the promoters. DNA hypermethylation & DNA hypomethylation is also a hallmark of cancer.

TLS Online TPP Program

#Id: 5513

#Unit 10. Ecological Principles

The size of a population is determined by a balance between births, immigration, deaths and emigration.

TLS Online TPP Program

#Id: 5515

#Unit 10. Ecological Principles

Natality means production of new individuals (offspring). 

Maximum or Absolute natality - maximum offspring produced under most suitable environmental conditions. 

Ecological natality - refers to number of offspring produced under prevailing environmental conditions.

TLS Online TPP Program

#Id: 5516

#Unit 10. Ecological Principles

Mortality refers to death of individuals in a population. 

Minimum mortality rate, minimum death rate which occurs under ideal conditions of environment

Actual death rate is referred to as Ecological mortality.

TLS Online TPP Program

#Id: 5517

#Unit 10. Ecological Principles

Biotic potential / Intrinsic rate of natural increase (r) It is the inherent power of a population to grow and reproduce when environmental conditions are favorable, and resources are unlimited. 

TLS Online TPP Program

#Id: 5518

#Unit 10. Ecological Principles

Net reproductive rate, the average number of female offspring produced by all the females in a population over the course of a generation.

TLS Online TPP Program

#Id: 5519

#Unit 10. Ecological Principles

Age-specific fertility and survivorship data help determine net reproductive rate (R₀).