Allopatric Speciation: Ecological Niche: Adaptive Radiation: Divergent Evolution: similar to an ancestral Convergent Evolution: Gradualism: Punctuated Equilibrium
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- Which of the following is NOT necessary for speciation to take place? Genetic divergence Physical separation by a geographic barrier Separation in space or time Reproductive isolationChoose which evolutionary mechanism is most likely to cause speciation events. founder effect gene flow mutation natural selection non-random matingWhich of the following sets of evidence supports the idea that species share common ancestry? Similar modern species are often found living in the same areas Different species share similarities at the genetic, developmental, and structural level Modern populations can be observed diverging from one another, indicating the start of speciation All of the above
- What is the nature of the reproductive barrier between a species that mates at dawn (sunrise) and a species that mates at dusk (sunset)? gametic temporal habitat behavioral mechanical A mountain range divides a freshwater snail species into two isolated populations. Erosion eventually lowers the range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of allopatric speciation gradualism punctuated equilibrium extinction sympatric speciationMale bowerbirds construct elaborate nests in order to attract females. Different species of bowerbirds often live in the same area, yet they will not mate with each other because of the females' strong preferences for a particular kind of nest. What does this exemplify? convergent evolution reproductive isolation homologous structures geographic isolationGeographic isolation is an isolating mechanism in nature. Over long periods of time, it can lead to speciation. As the name suggests, geographic isolation is when populations of a species become separated geographically. This could also happen from the founder effect, where a small group breaks away from a larger population and establishes a group in an isolated area. Isolation could also occur when a geographic event, like an earthquake or a landslide separates a population. Once the populations are separated evolution can occur through multiple mechanisms. Natural selection could act on each population, where some individuals have favorable traits for survival. Genetic drift can occur, where genotypes become more common due to random chance. These mechanisms can lead to each subpopulation becoming so different, that they can no longer interbreed and are considered separate species. TIME ●00 • ORIGINAL GEOGRAPHIC REPRODUCTIVE SPECIATION POPULATION BARRIER ISOLATION 1. We have…
- A new species seems to be forming in areas where there is geographic separation between the divergent populations. If true, this would represent an example of: Peripatric speciation Genetic drift Sympatric speciation Adaptive radiation Allopatric speciationWhich part of these statements isn't right ? A species is a group of organisms that can potentially interbreed with one another to produce viable, fertile offspring. Speciation is when two new species form from one original one. Sympatric speciation occurs when there is a geographic separation of a population. Allopatric speciation occurs while the population remains in the same area. Adaptive radiation occurs when one species evolves into many to fill several different niches. Natural selection requires traits to be passed from parent to offspring, more offspring are produced than can survive creating competition, and inherited traits vary among offspring. Fossils, Anatomy and embryology, biogeography, and molecular biology all provide support for the theory of evolution. Evolution can be driven by many different things. Mutations are changes in DNA that create new alleles in a population. Gene flow is the flow of alleles in and out of a population resulting from the migration…Vertical 11 1. Involves the formation of new species from pre-existing species. 8 3. Group of organisms that are capable of producing viable and fertile offspring 5. A mechanism that keeps species from mating with other. 7. it means "beside" 13 9. offspring of parents that differ in genetically determined traits. 12 11. Incapable of producing offspring 13. In temporal or seasonal isolation the reproduction is prevented by 10 15 14 Horlzontal 2. The role or the organism in the environment 4. It means "Place" 6. _itself is not only the mechanism of change overtime but it reduce the gene flow 8. Prevents the Fertilization of the eggs 10. An isolation wherein there's a differences in reproductive organs prevent successful Interbreeding. 12. It means "near" 14. Prevents the formation of fertile offspring 15. Formation of new species from the hybridization of 2 different species
- Define the following terms: divergent evolution, convergent evolution, analogous structures, homologous structuresDefine each in two short sentences Allopatric speciation Sympatric speciation Adaptive radiation Convergent evolution Analogous Homologousthe evolution of new morphological forms genetic drift speciation natural selection gene flow reproductive isolation A factor (such as the separation of continents by continental drift) that reduces groups of organisms promotes on a grand scale. can lead to the fixation of alleles, causing Adaptive evolution by as the high rates of speciation that occur during adaptive radiation. Reset Help at a wide range of loci is a major cause of in many and promoting speciation. as well
