What distinguishes disruptive and directional selection pressures when both select for extreme genetic traits? …
Disruptive selection
What is the difference in directional and disruptive selection?
In directional selection,
a population’s genetic variance shifts toward a new phenotype when exposed to environmental changes
. … In diversifying or disruptive selection, average or intermediate phenotypes are often less fit than either extreme phenotype and are unlikely to feature prominently in a population.
What is the difference between directional selection stabilizing selection and disruptive selection?
Each type of selection contains the same principles, but is slightly different.
Disruptive selection favors both extreme phenotypes
, different from one extreme in directional selection. Stabilizing selection favors the middle phenotype, causing the decline in variation in a population over time.
Why do disruptive selection pressures tend to favor rapid?
Why do disruptive selection pressures tend to favor rapid evolutionary changes? a.
They result in sudden gene frequency changes
. … They result in sudden gene frequency changes.
What is the difference between directional disruptive and stabilizing selection quizlet?
2:Disruptive Selection occurs when selection favors the
extreme trait values over
the intermediate trait values. … 3:Stabilizing Selection occurs when selection favors the intermediate trait value over the extreme values.
What are 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 stabilizing selection example?
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 do stabilizing and disruptive selection have in common?
What do stabilizing selection and disruptive selection have in common?
They both decrease genetic variation
. Under which condition would a mutation have the most impact on allele frequency? … After the flood, the ant population increases, but its allele frequency is different.
What happens during disruptive selection?
Disruptive selection, also called diversifying selection, describes
changes in population genetics in which extreme values for a trait are favored over intermediate values
. In this case, the variance of the trait increases and the population is divided into two distinct groups.
How does disruptive selection occur?
Disruptive selection occurs when
individuals of intermediate phenotype are less fit than those of both higher and lower phenotype
, such that extremes are favored. This may occur if there are two diverse food sources or predators with diverse preferences for, say, size of prey.
What is the rarest distribution pattern in nature?
The rarest distribution pattern in nature is
random
.
Which of the following best describes the relationship between Jaguars and Panthers?
Which of the following best describes the relationship between jaguars and panthers? a.
Panthers and jaguars are separate species
. … Panthers are jaguars with predominantly dark or black pigmentation.
Which of the following is not a reason for cluster distribution of organisms?
Territorial behavior
is not a reason for cluster distribution of organisms.
What will a stabilizing force select for in a population?
Stabilizing selection causes
the narrowing of the phenotypes seen in a population
. This is because the extreme phenotypes are selected against, causing reduced survival in organisms with those traits. … This narrowing of phenotypes causes a reduction in genetic diversity in a population.
Which is true of disruptive selection?
Disruptive selection is an
evolutionary force that drives a population apart
. The disruptive selection will cause organsisms with intermediate traits to reproduce less, and will allow those organisms with extreme traits to reproduce more. This causes the alleles for the extreme traits to increase in frequency.
What is meant by directional selection in populations?
Directional selection occurs when
individuals with traits on one side of the mean in their population survive better or reproduce more than those on the other
. It has been demonstrated many times in natural populations, using both observational and experimental approaches.
