Synthesis: How does reproductive isolation differ in sympatric modes and allopatric modes of speciation? Sympatric speciation does not require geographic isolation. In thismodel, populations can live in the same area, but may occupy differentniches. A niche refers to an organism's way of life, which might includeaspects of how it hunts, where it lives, and food preferences.For example, 200 years ago, apple maggot flies laid their eggs only onhawthorns – but today, these flies lay eggs on hawthorns and domesticapples (which were introduced to America). Females generally choose tolay their eggs on the type of fruit they grew up in, and males tend to lookfor mates on the type of fruit they grew up in. So hawthorn flies generallyend up mating with other hawthorn flies and apple flies generally end upmating with other apple flies.In general, sympatric evolution occurs within populations that are notcompletely separate, but have separate behaviors or choices thatISOLATE them.

Speciation refers to the formation of distinct two species from the ancestral species. Reproductive…

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How does reproductive isolation differ in sympatric modes and allopatric modes of speciation?

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter11: Evolution And Its Processes

Section: Chapter Questions

Problem 20CTQ: Two species of fish had recently undergone sympatric speciation. The males of each species had a...

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Concept explainers

Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.

Question

Synthesis: How does reproductive isolation differ in sympatric modes and allopatric modes of speciation?

Sympatric speciation does not require geographic isolation. In this
model, populations can live in the same area, but may occupy different
niches. A niche refers to an organism's way of life, which might include
aspects of how it hunts, where it lives, and food preferences.
For example, 200 years ago, apple maggot flies laid their eggs only on
hawthorns – but today, these flies lay eggs on hawthorns and domestic
apples (which were introduced to America). Females generally choose to
lay their eggs on the type of fruit they grew up in, and males tend to look
for mates on the type of fruit they grew up in. So hawthorn flies generally
end up mating with other hawthorn flies and apple flies generally end up
mating with other apple flies.
In general, sympatric evolution occurs within populations that are not
completely separate, but have separate behaviors or choices that
ISOLATE them.

Definition Definition Process by which new species arise. This occurs when populations of a species become isolated and diverge, developing unique traits through natural selection, genetic drift, or other mechanisms. Over time, these differences accumulate until the populations can no longer interbreed and are considered separate species.

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