Science, asked by chauhanramjeet453, 4 months ago

explain important of cosy as group of evolution
class 10th
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Answered by sarojuniyal11
1

Answer:

R.B. Langerhans, in Encyclopedia of Ecology, 2008

Types of Coevolution

A few different categories of coevolution are often discussed by scientists in ecology and evolutionary biology: pairwise coevolution, diffuse coevolution, and gene-for-gene coevolution. Pairwise coevolution (or ‘specific’ coevolution) describes tight coevolutionary relationships between two species. Diffuse coevolution (or ‘guild’ coevolution) refers to reciprocal evolutionary responses between suites of species. This type of coevolution emphasizes that most species experience a complex suite of selective pressures derived from numerous other species, and their evolutionary responses change the selective environment for other species. Gene-for-gene coevolution (or ‘matching gene’ coevolution) describes the specific case where coevolution involves gene-for-gene correspondence among species, such as when hosts and parasites have complementary genes for resistance and virulence.

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Coevolution

Douglas J. Futuyma, in Encyclopedia of Insects (Second Edition), 2009

Concepts of Coevolution

Coevolution refers to several processes. One possible form of coevolution is cospeciation, the coordinated branching (speciation) of interacting species (such as host and parasite). To the extent that this has occurred, concordant (or matching) phylogenies of host and parasite clades (or evolutionary lines) would be expected. Cospeciation might be caused by the interaction between species, but it could also result from a joint history of geographic isolation, assuming that divergence and reproductive isolation evolve at similar rates in the two groups. Concordance of the two phylogenies implies a longer history of association, and of opportunity for reciprocal adaptation, than, for example, when parasites or symbionts have frequently switched from one host to another. Host switching can be inferred from certain patterns of discordance between host and symbiont phylogenies.

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Answered by pandeybhawanishankar
1

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