Patterns of Evolution

What type of natural selection is shown?

• stabilizing selection

• disruptive selection

• directional selection

Tags

NGSS.HS-LS4-4

A larger chicken can scratch faster and find/eat more bugs and food than a smaller chicken. The larger chicken out-competes the smaller chickens when food supplies are limited. What type of selection is most likely occurring?

• directional selection

• disruptive selection

• stabilizing selection

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

What type of natural selection is shown?

• stabilizing selection

• disruptive selection

• directional selection

Tags

NGSS.HS-LS4-4

If a plant is too short, it may not be able to compete with other (taller) plants for sunlight. However, extremely tall plants may be more susceptible to wind damage. Medium-height plants seem to not have either problem. What type of selection is most likely occurring?

• directional selection

• disruptive selection

• stabilizing selection

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

What type of natural selection is shown?

• stabilizing selection

• disruptive selection

• directional selection

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

In a population of squirrels, short tails prevent predators from catching the short-tailed squirrels while they are on the ground. The longer tails help the squirrels balance better when up in the trees. Medium-length tails do not give a benefit, so there are very few medium tail squirrels. What type of natural selection is shown?

• stabilizing selection

• disruptive selection

• directional selection

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

In Missouri, the river otter was basically extirpated (locally extinct). A small group of breeding pairs were taken from an area in Tennessee and brought to Missouri. This small group of river otters began to successfully reproduce in MO for many decades. This is an example of ______.

• natural selection

• genetic bottleneck

• founder effect

Tags

NGSS.HS-LS4-2

Around 1814, a small group of British colonists founded a settlement on Tristan da Cunha, a group of small islands in the Atlantic Ocean, midway between Africa and South America. One of the early colonists apparently carried a rare, recessive allele for retinitis pigmentosa, a progressive form of blindness that afflicts homozygous individuals. As late as 1961, the majority of the genes in the gene pool on Tristan were still derived from 15 original ancestors; as a consequence of the inbreeding. This type of blindness is significantly higher in the small island group when compared to the general public in other geographic areas. What pattern of genetic change is being described?

• founder effect

• natural selection

• genetic bottleneck

Due to several decades of humans taking away habitats and fatalities with hitting the Florida panther on the highways, the population size of the Florida panther dwindled down to about 6 mating partners. Efforts were made to save and protect the Florida panther, whose population size is now growing again. What type of pattern of genetic change is being described?

• genetic bottleneck

• natural selection

• founder effect

Tags

NGSS.HS-LS4-2

What type of pattern of genetic change is being described?

A sudden disaster or catastrophe kills many individuals in a population, which leaves behind only a small number of survivors to "restart" the population growth cycle again. This small group of survivors do not have all the variety in the gene pool as the original population once had.

• founder effect

• genetic bottleneck

• natural selection