Introduction to Population Genetics (Chapter 16 Vocabulary)
|stabilizing selection||individuals with the average form of a trait have the greatest fitness|
|disruptive selection||individuals with either extreme variation of a trait have the greatest fitness|
- 1 When individuals display a more extreme form of a trait have greater fitness than individuals with an average form of the trait it is called?
- 2 When individuals are only one end of a bell curve of phenotype frequencies have high fitness the result is?
- 3 What is directional stabilizing and disruptive selection?
- 4 What causes stabilizing selection?
- 5 What happens to the average value of the trait in a population as a result of directional selection?
- 6 Which type of natural selection shown in the figure favors average individuals?
- 7 What type of selection would occur when the curve is shaped like a bell few at the extremes majority at the average?
- 8 What is the combined genetic makeup of all members of a population?
- 9 How does the range of phenotypes for single-gene traits differ from the range for polygenic traits?
- 10 What is the result of directional selection?
- 11 What trait S is favored in disruptive selection?
- 12 What is decreased as a result of stabilizing selection?
- 13 When the average individual not either of the extremes has an advantage it is called which type of selection?
- 14 What best illustrates a result of natural selection?
- 15 What does evolutionary fitness measure?
When individuals display a more extreme form of a trait have greater fitness than individuals with an average form of the trait it is called?
selection that is disruptive Persons that exhibit either extreme variety of a characteristic are more fit than individuals who exhibit the average form of the trait.
When individuals are only one end of a bell curve of phenotype frequencies have high fitness the result is?
When people at one end of the curve have better fitness than individuals in the center or at the other end of the curve, this is referred to as directional selection.
What is directional stabilizing and disruptive selection?
Each sort of selection is based on the same principles as the others, although they are significantly different. Disruptive selection supports both extreme phenotypes, in contrast to directional selection, which prefers just one extreme. Stabilizing selection promotes the middle phenotype in a population, resulting in a decrease in variance over time in that group.
What causes stabilizing selection?
Despite the fact that each sort of selection is based on the same principles, they are significantly different in their implementation. In contrast to directional selection, which promotes just one extreme phenotype, disruptive selection encourages both extreme phenotypes. When selection favors the center phenotype, the population’s variance decreases with time, which is referred to as stabilizing selection in biology.
What happens to the average value of the trait in a population as a result of directional selection?
Stabilizing selection is the process of reducing the amount of variation in a characteristic over time. Due to the fact that very little and extremely big infants are more likely to die, the range of birthweights becomes more narrowed. Disruptive selection increases the amount of diversity in a characteristic as a result of natural selection.
Which type of natural selection shown in the figure favors average individuals?
A sort of natural selection known as stabilizing selection in evolution is a type of selection that favors the average individuals in a group.
What type of selection would occur when the curve is shaped like a bell few at the extremes majority at the average?
Disruptive selection is a kind of natural selection in which individuals in a population are selected against their average characteristics. The phenotypes (people who exhibit groupings of characteristics) of this sort of population would be found at both extremes, with just a small number of individuals in the middle.
What is the combined genetic makeup of all members of a population?
A gene pool is the genetic information derived from all of the individuals of a certain population that has been combined. A gene pool often contains two or more alleles for a particular characteristic, depending on the trait.
How does the range of phenotypes for single-gene traits differ from the range for polygenic traits?
What is the difference between the range of phenotypes associated with single-gene characteristics and the range associated with polygenic traits? Single-gene characteristics are characterized by having just two different phenotypes. Polygenic characteristics can manifest themselves in a variety of phenotypes. It has the potential to cause shifts in allele frequencies as well as the development of characteristics.
What is the result of directional selection?
Directional selection is responsible for the “hard lifting” of evolution by tending to shift the characteristic mean toward the value that is most appropriate for the environment in question. It leads to an increase in the adaptability of organisms. It is the fundamental mechanism that Charles Darwin himself imagined as being responsible for adaptive evolution in the first place.
What trait S is favored in disruptive selection?
When both extreme qualities are rewarded in an environment, this is referred to as disruptive selection. Disruptive selection enhances genetic and phenotypic variety in a population because more than one phenotype, or physical attribute, is preferred in a population under consideration. As a result, disruptive selection is also referred to as diversified selection in certain circles.
What is decreased as a result of stabilizing selection?
When natural selection favors an average phenotype and selects against extreme variances, stabilizing selection results in a reduction in the genetic diversity of a population. When a population is subjected to environmental changes, the genetic variation of the population moves toward a new phenotype, which is known as directional selection.
When the average individual not either of the extremes has an advantage it is called which type of selection?
Selection that is more diverse (or disruptive) It is possible for natural selection to select for two or more unique phenotypes, each of which has its own set of benefits. It is typically the case that the intermediate phenotypes are less fit than their extreme counterparts in these situations.
What best illustrates a result of natural selection?
Which of the following best exemplifies the concept of natural selection? – An organism that has favorable genetic variants will have a higher chance of surviving and reproducing effectively. For an extended length of time, a tiny group of chimpanzees has been living in an environment that has not changed.
What does evolutionary fitness measure?
Natural selection (also known as sexual selection in population genetics models) is a quantitative representation of natural and sexual selection in evolutionary biology. Depending on the context, it can be described either in terms of genotype or in terms of phenotype in a certain environment. The fitness of a particular phenotype might also change depending on the selective context in which it is found.