0
A new species can occur when;
1. Change in allele frequencies
-genetic drift can result in loss of alleles in a population
-one allele becomes the only variation, becomes "fixed"
2. Gene flow due to migration
-movement of alleles into or out of a population
3. Non-random mating
-individuals have preferred mates rather than random
4. Mutations
-a change in DNA can be beneficial, neutral, or harmful
5. Natural Selection
-best adapted, more likely to survive
What else can I help you with?
The evolution of reproductive isolation between two or more groups of organisms is?
The origin of new species. To be considered a member of a singe species, organisms must be capable of reproducing and producing viable offspring. Once they have evolved to become reproductively isolated, they can no longer fulfill these requirements and are considered separate species.
How can islation lead to formation of new species?
Allopatric Speciation (geographic isolation) can lead to the formation of a new species because the population is split in two smaller populations by a physical barrier (river, canyon, mountain...).
Does speciation form new species?
The term 'speciation' does indeed refer to the 'formation' of new species. 'Formation' is probably better replaced with 'divergence' as in 'the divergence of two species from one'. A common ancestor of two species may have two of its populations isolated, so the two populations cannot interbreed. Genetic differences (via mutation) should build up in the two populations over time or indeed, simply the mixing of genes via meiosis within the two populations could follow different routes. The non-mixing of the two populations would ensure the non-homogenisation of the gene pool, ensuring a homogenisation of the morphology of the species back to the morphology of the common ancestor. Eventually, so much genetic difference should build up between the two populations that, be they removed from isolation or not, the two populations would no longer be able to interbreed and produce fertile offspring. Remove the ability of interbreeding and, within the Biological Species Concept, the two populations would have diverged into two separated species. Speciation would have occurred.
Do variations in populations lead to new species?
Variations in offspring are acted upon by natural selection: some offspring will be slightly more proficient at producing new offspring than others. This means that some alleles will promulgate throughout the population gene pool at a faster rate than others, resulting in a shifting frequency of incidence in the population gene pool. This is what evolution is: shifting allele frequencies in the population gene pool.
Speciation is the process by which new species?
a new species arises or forms!
At what point are two populations descending from the same ancestors considered separate species?
When they have reproductive isolation. This happens when either physical or biological barriers prevent reproduction between the two populations. At that point, their mix of genes will be significantly different that they will be considered two new species.
Describes why the two minnow populations evolved into separate species?
Different selective pressures were acting upon the two populations, leading to an increase in genetic variation and the formation of two new species. study island
Which best describes why the two minnow populations evolved into separate species?
Different selective pressures were acting upon the two populations, leading to an increase in genetic variation and the formation of two new species.(study island)
The formation of a new species can result from?
The formation of a new species can result from processes such as geographic isolation, genetic mutations leading to reproductive isolation, and natural selection favoring different traits in separate populations. Over time, these factors can drive genetic divergence between populations to the point where they are no longer able to interbreed successfully, leading to the development of a new species.
Process in which isolated populations of the same species become new species is called?
In Sympathetic Speciation, a species evolves into a new species without any barriers that separate the populations.In Allopatric Speciation, a population divided by a barrier, each population evolves separately, and eventually two populations cannot successfully interbreed.
What do organisms change into over long periods of time?
Organisms can evolve into new species over long periods of time through the process of natural selection and adaptation to their environment. This can result in the development of new characteristics and the divergence of populations into separate species.
What is the role of gene flow in evolution?
Gene flow is the movement of genes between populations, which can introduce new genetic variations and prevent populations from diverging into separate species. It can increase genetic diversity, reduce differences between populations, and potentially lead to the spread of beneficial traits throughout a species. Gene flow is important in evolution as it promotes genetic exchange and maintains the genetic cohesion of a species.
What happens when members from separated populations do not reproduce with each other?
Over time, the populations may become genetically distinct from one another due to accumulation of different mutations. This can lead to the evolution of new species if the genetic differences become significant enough to prevent successful reproduction between individuals from the two populations.
What type of speciation occurs when new species arise as a result of geographic isolation?
When a certain species is divided up into two or more separate populations (geographically, for example) they continue to evolve (via natural selection) and over time the two (or more) populations will be so different from each other that they will not be able to reproduce, and will fit the criteria of different species.
What is it called when a species evolves into a new species without a physical barrier separating populations?
coevolution
What describes why the two minnow populations evolved into separate species?
The two minnow populations likely evolved into separate species due to geographic isolation, genetic drift, and natural selection. Over time, differences in their environments caused genetic mutations to accumulate in each population, leading to reproductive isolation and the establishment of distinct traits that are better suited to their respective habitats.
How can a new species from?
To put it simply, new species can form when organisms within a population become so genetically different they can no longer reproduce with one another without generating harmful mutations. This can be caused by genetic drift and geographic isolation. Two populations of the same species who live in different parts of the world will diverge and go on separate genetic paths, until eventually the two populations become genetically different and branch off into two different species.
