What type of selection is most likely responsible for the large antlers seen on male elk? Directional selection favors one end of the phenotype distribution, whereas stabilizing selection
What type of selection is most likely responsible for the large antlers seen on deer?
Intrasexual selection is typically responsible for the evolution of male armaments such as deer antlers, beetle horns, and large body size, that provide individuals with an advantage when fighting off potential competitors.
What is an example of stabilizing selection?
Stabilizing selection in evolution is a type of natural selection that favors the average individuals in a population. ... Classic examples of traits that resulted from stabilizing selection include human birth weight, number of offspring, camouflage coat color, and cactus spine density .
What causes stabilizing selection?
In that way, like all forms of selection, the cause of stabilizing selection is the increased fitness and reproductive success that the median individuals have . The extreme versions or traits have a disadvantage, in one way or another. This disadvantage, in evolutionary terms, is decreased reproduction.
Why is stabilizing selection most common?
Stabilizing selection tends to remove the more severe phenotypes , resulting in the reproductive success of the norm or average phenotypes. This means that most common phenotype in the population is selected for and continues to dominate in future generations.
What are the three types of natural selection?
- Stabilizing Selection.
- Directional Selection.
- Disruptive Selection.
Why don t deer antlers or peacock tails just keep getting larger?
2. Why don’t deer antlers or peacock tails just keep getting larger? (Answer: Natural selection is still at work , and at some point these adaptations for reproduction begin to significantly impede the organism’s ability to survive.)
Does stabilizing selection change the mean?
Stabilizing selection reduces the amount of variation in a trait . For example, very small and very large babies are most likely to die, leaving a narrower distribution of birthweights. Disruptive selection increases the amount of variation in a trait.
Which type of selection is most common?
The most common of the types of natural selection is stabilizing selection . In stabilizing selection, the median phenotype is the one selected for during natural selection.
Does stabilizing selection increase fitness?
Natural selection on polygenic traits can take the form of: Stabilizing selection: Intermediate phenotypes have the highest fitness , and the bell curve tends to narrow. Directional selection: One of the extreme phenotypes has the highest fitness. The bell curve shifts towards the more fit phenotype.
How do you explain natural selection?
Natural selection is the process through which populations of living organisms adapt and change . Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others.
What are some examples of disruptive selection?
- Peppered moths: One of the most studied examples of disruptive selection is the case of London’s peppered moths. ...
- Oysters: Light- and dark-colored oysters could also have a camouflage advantage as opposed to their medium-colored relatives.
What is disruptive selection and give an example?
Disruptive selection produces a population that has two extreme versions of a trait as the dominant phenotype . For example, if both short and tall organisms, but not medium height organisms were favored this would be disruptive selection in action.
Is natural selection random?
The genetic variation on which natural selection acts may occur randomly, but natural selection itself is not random at all . The survival and reproductive success of an individual is directly related to the ways its inherited traits function in the context of its local environment.
How does stabilizing selection affect a population?
Stabilizing selection results in a decrease of a population ‘s genetic variance when natural selection favors an average phenotype and selects against extreme variations . In directional selection, a population’s genetic variance shifts toward a new phenotype when exposed to environmental changes.
Can Stabilising selection lead to speciation?
Assortative mating alone can lead to speciation , but rare phenotypes’ disadvantage in finding mates and intermediate phenotypes’ advantage due to stabilizing selection strongly impede speciation. Any increase in the number of loci also decreases the likelihood of speciation.
