When populations of closely related pied flycatchers and collared flycatchers live in different geographic areas?
When populations of closely related pied flycatchers and collared flycatchers live in different geographic areas, the males of both species look a lot alike. However, when populations of the two species share a common geographic area, there are significant differences in the appearance of the two species.
What can account for this high level of diversity in a single habitat?
What can account for this high level of diversity in a single habitat? Lake Victoria has a variety of environments such as rocky shores and muddy bottoms; this environment heterogeneity promotes speciation.
What is the major evidence for the punctuated equilibrium model of evolution quizlet?
What is the major evidence for the punctuated equilibrium model of evolution? Many fossil species appear suddenly in the fossil record, persist unchanged for long periods, and then disappear without transitional forms.
Which one is an example of a Prezygotic barrier in which the two different species do mate?
Which one is an example of a prezygotic barrier in which the two different species do mate? Two dragonfly species regularly mate, but their gametes are incompatible. -No zygote is formed, but mating does occur.
When subpopulations are geographically isolated from each other the process is known as?
Parapatric speciation occurs when subpopulations of the same species are mostly isolated from each other, but have a narrow area where their ranges overlap. This may be due to a partial geographic barrier or an unequal distribution of members of the subpopulations.
Why are the large finches now living on the Galápagos Islands different from the original source population from a nearby island?
Why are the large finches now living on the Galápagos Islands different from the original source population from a nearby island? –Genetic drift occurred in the two populations. (Why: Physical isolation, natural selection, and genetic drift are all events that lead to speciation.)
What is biodiversity in environmental science?
Biodiversity is the variety of all life forms on earth—the different plants, animals and micro-organisms, their genes, and the terrestrial, marine and freshwater ecosystems of which they are a part.
How does the biodiversity of an ecosystem help maintain ecological balance and resilience?
Biologically diverse communities are also more likely to contain species that confer resilience to that ecosystem because as a community accumulates species, there is a higher chance of any one of them having traits that enable them to adapt to a changing environment.
What term describes the pattern of evolutionary change that takes place slowly and steadily over long periods of time?
Scientists think that species with a shorter evolution evolved mostly by punctuated equilibrium, and those with a longer evolution evolved mostly by gradualism. Gradualism is selection and variation that happens more gradually.
What is meant by extinct How do scientist obtain information about extinct species?
What is meant by extinct? How do scientists obtain information about extinct species? A species is extinct if no members of that species are still alive. Most of what scientists know about extinct species is based on the fossil record.
How does behavioral isolation serve as a Prezygotic isolating mechanism for members of different species?
____________ isolation serves as a prezygotic isolating mechanism by preventing members of two species from ever coming into contact with one another because of differences in their habitats. Dog breeders maintain the purity of breeds by keeping dogs of different breeds apart when they are fertile.
Which kind of reproductive barrier mechanisms are elaborate courtship rituals and blue footed boobies courtship dance?
A prezygotic reproductive barrier. Courtship rituals that attract mates and other behaviors unique to a species are effective reproductive barriers, even between closely related species. Example: Blue-footed boobies mate only after a courtship display unique to their species.
What is the process by which speciation is completed after two diverging populations come in contact?
Parapatric speciation occurs when two populations are not completely separated.
When two subpopulations of a species evolve reproductive isolation from one another while continuing to exchange genes?
In parapatric speciation, two subpopulations of a species evolve reproductive isolation from one another while continuing to exchange genes.
How did Charles Darwin use the different species of finches found on the Galapagos Islands to develop his theory of evolution?
However, the Galapagos finches helped Darwin solidify his idea of natural selection. The favorable adaptations of Darwin's Finches' beaks were selected for over generations until they all branched out to make new species. These birds, although nearly identical in all other ways to mainland finches, had different beaks.
How do the diverse modern day finches of the Galapagos demonstrate the concept of adaptive radiation?
Darwin's finches are a classical example of an adaptive radiation. Their common ancestor arrived on the Galapagos about two million years ago. During the time that has passed the Darwin's finches have evolved into 15 recognized species differing in body size, beak shape, song and feeding behaviour.
How does the concept of biodiversity help in tackling the ecological question discuss?
Biodiversity boosts ecosystem productivity where each species, no matter how small, has an important role to play. For example, A larger number of plant species means a greater variety of crops. Greater species diversity ensures natural sustainability for all forms of life.
What is biodiversity btech?
“Biodiversity is the variation among living organisms from different sources including terrestrial, marine and desert ecosystems, and the ecological complexes of which they are a part.”
What is biodiversity discuss the value of biodiversity What are main causes of biodiversity loss?
Biodiversity loss is caused by five primary drivers: habitat loss, invasive species, overexploitation (extreme hunting and fishing pressure), pollution, climate change associated with global warming. In each case, human beings and their activities play direct roles.
Which describes the modern classification system based on evolutionary relations Linnaean classification based on similar appearances called Darwinian classification?
It is called phylogenetic classification. It is called cladistics.
Which type of evolution refers to changes that result in the emergence of new species?
Speciation is an evolutionary process by which a new species comes into being. A species is a group of organisms that can reproduce with one another to produce fertile offspring and is reproductively isolated from other organisms.
Which scientific concept did Charles Darwin and Alfred Wallace independently discover?
Abstract. Charles Darwin and Alfred Russel Wallace independently discovered the mechanism of natural selection for evolutionary change.
In what ways have geologic changes influenced evolutionary events or extinctions?
HOW DO GEOLOGICAL PROCESSES AND CLIMATE CHANGE AFFECT EVOLUTION? shifted wildlife habitats, wiped out large numbers of species, and created opportunities for the evolution of new species. For hundreds of millions of years, tectonic plates have drifted slowly on the planet's mantle to shape Earth's surface.
What type of Isolation serves as a Prezygotic isolating mechanism when a geographic barrier prevents different species from interbreeding?
Prezygotic barriers prevent members of different species from mating to produce a zygote, a single-celled embryo. Some example scenarios are below: Two species might prefer different habitats and thus be unlikely to encounter one another. This is called habitat isolation.
What type of reproductive isolation mechanisms produces infertile hybrids or prevent hybrid offspring from developing multiple choice question?
Postzygotic isolating mechanisms prevent successful interbreeding among members of different species.
What color feet do boobies have?
The causal reason is that carotenoid pigments, which the boobies get through their diet, are concentrated in their feet, making them appear blue in colour. The concentration of these pigments determines the strength of the colour of the feet, with higher concentrations making the feet a more intense colour of blue.
Why are blue-footed boobies called boobies?
Those feet have led to the common names like red-footed and blue-footed. But why do we call them boobies? The name comes from bobo, a Spanish slang term for stupid- a reference to how easily the birds could be captured by 18th century Spanish sailors. Boobies, like most seabirds, can spend weeks or months out at sea.
What is the significance of the process of speciation to change in populations from generation to generation?
Through this process of natural selection, favorable traits are transmitted through generations. Natural selection can lead to speciation, where one species gives rise to a new and distinctly different species. It is one of the processes that drives evolution and helps to explain the diversity of life on Earth.
What happens when two populations become geographically separated from each other and then genetic divergence occurs?
Allopatric speciation occurs when one population separates into two geographically isolated populations. The geographic isolation prevents gene transfer and reproduction, allowing for genetic divergence between the two populations.
When two populations are reproductively isolated What else must occur for speciation to happen?
For speciation to occur, two new populations must be formed from one original population, and they must evolve in such a way that it becomes impossible for individuals from the two new populations to interbreed.