When a multipotent stem cell divides asymmetrically, its maturing daughter cell often goes through a transition stage as a progenitor or transit-amplifying cell, as is seen in the formation of blood cells, sperm, and neurons.

TLS Online TPP Program

#Id: 9562

#Unit 11. Evolution and Behavior

Neutral theory of molecular evolution

Developed by Motoo Kimura, who argued that most of the evolution of DNA sequences occurs by chance (genetic drift) rather than by natural selection. 

TLS Online TPP Program

#Id: 9563

#Unit 11. Evolution and Behavior

Theory of recapitulation - Ernst Haeckel

He proposed that the embryonic development of an individual organism (its ontogeny) followed the same path as the evolutionary history of its species (its phylogeny).

TLS Online TPP Program

#Id: 9564

#Unit 11. Evolution and Behavior

Bergmann’s rule: Populations in colder climates tend to have greater body mass than those in warmer climates.

TLS Online TPP Program

#Id: 9565

#Unit 11. Evolution and Behavior

Haldane’s rule: Hybrid sterility or hybrid inviability is often limited to the heterogametic sex. 

TLS Online TPP Program

#Id: 9566

#Unit 11. Evolution and Behavior

Hamilton’s rule:  It states that an allele that causes an altruistic behavior will spread if the following condition is met (rb>C)

TLS Online TPP Program

#Id: 9567

#Unit 11. Evolution and Behavior

Cope’s rule:  A proposed generalization that individual body size in animals tends to increase during evolution.