How do you graph stabilizing selection?
Stabilizing selection is often shown on a graph as a modified bell curve where the central portion is narrower and taller than the normal bell shape. Diversity in a population is decreased due to stabilizing selection—genotypes which are not selected are reduced and can disappear.
What type of selection is each graph showing?
Graph 1 shows directional selection, in which a single extreme phenotype is favored. Graph 2 depicts stabilizing selection, where the intermediate phenotype is favored over the extreme traits.
What are the 3 types of selection graphs?
The 3 Types of Natural Selection
- Stabilizing Selection.
- Directional Selection.
- Disruptive Selection.
What is stabilizing selection in biology?
stabilizing selection: a type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value.
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.
What are the 5 key points of natural selection?
Natural selection is a simple mechanism that causes populations of living things to change over time. In fact, it is so simple that it can be broken down into five basic steps, abbreviated here as VISTA: Variation, Inheritance, Selection, Time and Adaptation.
Which is an example of stabilizing selection on a graph?
Stabilizing selection is often shown on a graph as a modified bell curve where the central portion is narrower and taller than the normal bell shape. Polygenic traits tend to result in a distribution that resembles a bell-shaped curve, with few at the extremes and most in the middle.
What happens to the mean of the population graph in directional selection?
In directional selection, one extreme of the trait distribution experiences selection against it. The result is that the population’s trait distribution shifts toward the other extreme. In the case of such selection, the mean of the population graph shifts.
How are traits coded for in stabilizing selection?
The traits they carry are coded for in part by their DNA, which they can only pass on through reproduction. In stabilizing selection, the increase in the median traits represents their increased success. The other extreme traits are not as successful, possibly causing their owners to die.
What happens to a bell curve during stabilizing selection?
It’s more or less a bell curve, with mostly intermediate phenotypes but also some extreme phenotypes at both ends of the spectrum. When stabilizing selection occurs, phenotypes at both extremes are selected against, and intermediate phenotypes are selected for. The bottom graph shows that the curve has become narrower and taller.