When individuals at only one end of the bell curve of phenotype frequencies have high fitness the result is?

Directional selection occurs when individuals at one end of the curve have higher fitness than individuals in the middle or at the other end.

1. When individuals with an extreme phenotype have the highest fitness the result is?
2. What type of selection would occur when the curve is shaped like a bell few at the extremes majority at the average?
3. Which type of selection can occur when individuals with phenotypes at the upper and lower ends of the curve have higher fitness than individuals near the middle?
4. How does the range of phenotypes for single-gene traits differ from the range for polygenic traits?
5. Which type of selection Favours individuals with variations at opposite extremes of a trait over individuals with intermediate variations?
6. When an environment eliminates individuals at the extremes of a population this is an example of which category of natural selection?
7. In which of the following is the fitness of individuals at one end of the normal distribution curve higher than that of individuals in the middle or at other end of the curve?
8. What is disruptive selection example?
9. How does directional selection affect the distribution of phenotypes?
10. What might happen when a Hox gene turns other genes on or off?
11. What is it called when a single trait is affected by more than one gene?
12. How are polygenic traits different from traits that only require 2 genes?
13. Would a trait that has only two distinct phenotypes more likely be a single?

When individuals with an extreme phenotype have the highest fitness the result is?

Directional selection: One of the extreme phenotypes has the highest fitness. The bell curve shifts towards the more fit phenotype. Disruptive selection: Both extreme phenotypes have a higher fitness than intermediate phenotypes. The bell curve develops two peaks.

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 type of natural selection that selects against the average individual in a population. The makeup of this type of population would show phenotypes (individuals with groups of traits) of both extremes but have very few individuals in the middle.

Which type of selection can occur when individuals with phenotypes at the upper and lower ends of the curve have higher fitness than individuals near the middle?

When individuals at the upper and lower ends of the curve have higher fitness than individuals near the middle, disruptive selection takes place.

How does the range of phenotypes for single-gene traits differ from the range for polygenic traits?

How does the range of phenotypes differ between single-gene traits and polygenic traits? Single-gene traits have only two distinct phenotypes. Polygenic traits can have many possible phenotypes. ... It can lead to changes in allele frequencies and the evolution of traits.

Which type of selection Favours individuals with variations at opposite extremes of a trait over individuals with intermediate variations?

Stabilizing selection is the opposite of disruptive selection. Instead of favoring individuals with extreme phenotypes, it favors the intermediate variants. Stabilizing selection tends to remove the more severe phenotypes, resulting in the reproductive success of the norm or average phenotypes.

When an environment eliminates individuals at the extremes of a population this is an example of which category of natural selection?

Directional selection

A type of selection that removes individuals from one end of a phenotypic distribution and thus causes a shift in the distribution. occurs when natural selection favors one extreme of continuous variation.

In which of the following is the fitness of individuals at one end of the normal distribution curve higher than that of individuals in the middle or at other end of the curve?

Directional selection occurs when individuals at one end of the curve have higher fitness than individuals in the middle or at the other end.

What is disruptive selection 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.

How does directional selection affect the distribution of phenotypes?

Three types of natural selection, showing the effects of each on the distribution of phenotypes within a population. Directional selection (centre column) acts against only one extreme of phenotypes, causing a shift in distribution toward the other extreme. ...

What might happen when a Hox gene turns other genes on or off?

Homeotic genes are responsible for determining the identity of particular segments or structures of the body. So, when homeotic genes are inactivated or expressed in unusual locations due to mutations, they may cause body segments to take on new—and sometimes startling!

What is it called when a single trait is affected by more than one gene?

​Polygenic Trait

= A polygenic trait is one whose phenotype is influenced by more than one gene. Traits that display a continuous distribution, such as height or skin color, are polygenic.

How are polygenic traits different from traits that only require 2 genes?

8) How are polygenic traits different from traits that only require 2 genes? The polygenic traits have a wide variation in each trait. ... The children can have more tall genes than either parent. The environment also plays a role in the expression of traits.

Would a trait that has only two distinct phenotypes more likely be a single?

A trait with only 2 distinct phenotypes is most likely to be a single gene trait.