Following are certain statements regarding

morphogen gradients and cell specification.

A. Morphogens are always transcription factors

B. Morphogens can be paracrine factors that are produced in one group of cells and travel to another population of cells

C. When the concentration of a morphogen drops below a certain threshold, cells stop differentiating and never get determined to another fate

D. Morphogen gradients are involved in conditional specification

Which combination of the above statements is true?

TLS Online TPP Program

#Question id: 4717

#Unit 11. Evolution and Behavior

 If Darwin had been aware of genes and their typical mode of transmission to subsequent generations, with which statement would he most likely have been in agreement?

TLS Online TPP Program

#Question id: 15716

#Unit 11. Evolution and Behavior

Evolutionary biology extends and amplifies the explanation of biological phenomena. It complements studies of the proximate causes (immediate, mechanical causes) of biological phenomena If we ask what causes a male bird to sing, the proximate causes include the action of testosterone or other hormones

TLS Online TPP Program

#Question id: 15717

#Unit 11. Evolution and Behavior

 In The Origin of Species, Darwin propounded two major hypotheses:

TLS Online TPP Program

#Question id: 15718

#Unit 11. Evolution and Behavior

Christians interpreted the biblical account of Genesis literally and concluded that each species had been created individually by God in the same form it has today. This belief is known as

TLS Online TPP Program

#Question id: 15719

#Unit 11. Evolution and Behavior

Carolus Linnaeus (1707–1778), who established the framework of modern taxonomy in his Systema Naturae (1735), won worldwide fame for his exhaustive classification of plants and animals, undertaken in the hope of discovering the pattern of the creation. Linnaeus classified,

TLS Online TPP Program

#Question id: 15720

#Unit 11. Evolution and Behavior

The geologists ________ expounded the principle of uniformitarianism, holding that the same processes operated in the past as in the present and that the data of geology should therefore be explained by causes that we can now observe.