Diversifying or disruptive selection increases genetic variance when natural selection selects for two or more extreme phenotypes that each have specific advantages.
Which type of selection leads to increased phenotypic and genetic creation?
Directional selection causes an increase in phenotypic (and genetic) variance associated with each module (Fig.
What will most likely happen to the population of moths in this habitat quizlet?
What will most likely happen to the population of moths in this habitat? The population of moths will eventually become extinct. A biology teacher asks students to give examples of genetic variations that support the idea that changes in a population’s environment affect genetic variation.
Which best describes biogeographic isolation quizlet?
Which best describes biogeographic isolation? It always leads to the formation of new species. It cannot lead to evolution. It is a mechanism for evolution.
What type of selection favors the survival of two or more different genotypes that produce different phenotypes?
– Directional selection occurs when one extreme phenotype is favored over another different extreme phenotype. – Directional selection leads to improved selection in a stable environment. – Disruptive selection leads to polymorphism, favoring different forms of the same species.
Which of the following forms of selection favors one extreme end of the distribution of a trait?
A type of selection that favors phenotypes at one extreme of a trait’s range is called directional selection.
How does natural selection control the phenotype traits of a population?
The genotype controls the phenotype by expressing proteins that create the observable traits. The traits that help an organism survive and reproduce are selected for through natural selection. Traits that help an organism survive and reproduce are passed on to future generations through the process of reproduction.
How does natural selection change the phenotypes within a population over time?
Natural selection can cause microevolution When a phenotype produced by certain alleles helps organisms survive and reproduce better than their peers, natural selection can increase the frequency of the helpful alleles from one generation to the next – that is, it can cause microevolution.
Why is natural selection more effective in large populations?
Deleterious alleles can reach high frequency in small populations because of random fluctuations in allele frequency. This may lead, over time, to reduced average fitness. In this sense, selection is more “effective” in larger populations.
Which of the following was the most likely effect of the Industrial Revolution on peppered moths in cities?
Which of the following was the most likely effect of the Industrial Revolution on peppered moths in cities? The population of light-colored moths decreased and the population of dark-colored moths increased.
What is most likely happening to the genetic variation of the population of North East Arctic cod?
What is most likely happening to the genetic variation of the population of North East Arctic Cod? The genetic variation in the population is decreasing due to selective pressure.
What is the main difference between adaptive radiation and other forms of speciation?
What is the main difference between adaptive radiation and other forms of speciation? Adaptive radiation is a mechanism for evolution. Adaptive radiation happens over a relatively short time. Adaptive radiation requires a founding population.
Which of the following must occur for speciation to happen geographic isolation?
Answer and Explanation: Speciation occurs when a species becomes two separate species. This means that the gene pools can no longer mix after the speciation event. In other words, the lack of interbreeding or reproductive isolation has to happen for the process of speciation to begin.
Which type of reproductive isolation occurs when there are difference in the size or shape of reproductive parts that may prevent interbreeding?
Mechanical isolation, when physical differences between two animals prevent mating.
Which of the following is an example of reproductive isolation quizlet?
Which of the following is an example of reproductive isolation? The morphological species concept does not rely on genetic information to differentiate between members of the same species, and the phylogenetic species concept does.
When extreme phenotypes are selected against and disappear which pattern of natural selection is at work?
Stabilizing selection occurs when phenotypes at both extremes of the phenotypic distribution are selected against.
Which types of selection tend to increase or maintain genetic diversity within a population?
Mutation is an evolutionary process that increases genetic diversity in populations. Even though it consistently leads to an increase in genetic diversity in a population, mutation is random with respect to the affected allele’s impact on the fitness of the individual.
What are the 4 types of selection?
- Stabilising selection.
- Disruptive selection.
- Directional selection.
What is natural selection mention the three ways through which natural selection operates?
1) Stabilization, in which more individual acquire mean character value i.e., medium sized individuals. 2)Direcctional, more individuals acquire value other than the mean character value. 3)Disruptive, more individuals acquire peripheral character value at both ends of distribution curve.
What are 3 types of natural selection?
(A) Directional selection; (B) stabilizing selection; (C) disruptive selection.
What impact can the bottleneck effect have on populations that have rebounded after near extinction?
After a population has rebounded after near extinction the bottleneck effect can leave it with very little genetic variation. Certain alleles have become fixed while others have been lost completely from the gene pool.
How are genetic characteristics associated with non reproductive activities such as feeding affected by natural selection?
How are genetic characteristics associated with non-reproductive activities such as feeding affected by natural selection? If animals don’t eat they will starve and not be able to reproduce. If they do eat they will be able to reproduce to continue their genes .
How can natural selection on single gene traits cause changes in allele frequencies?
Natural selection for a single-gene trait can lead to changes in allele frequencies and then to evolution. For example, a mutation in one gene that determines body color in lizards can affect their lifespan. So if the normal color for lizards is brown, a mutation may produce red and black forms.
What process favors survival of specific individuals within a population based on inherited characteristics?
Natural selection is a process that favors heritable traits that increase the survival chances of an organism, allowing the organism to reproduce more!
Which type of selection occurs when a population experiences a shift in diversity towards the larger organisms?
Diversifying (or disruptive) selection: Diversifying selection occurs when extreme values for a trait are favored over the intermediate values. This type of selection often drives speciation. Diversifying selection can also occur when environmental changes favor individuals on either end of the phenotypic spectrum.