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?

What type of natural selection is shown?

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?

What type of natural selection is shown?

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?

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 ______.

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?

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?

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.

The situation in which allele frequencies do not change is called _____.

Which scientist did this:

studied economics & human populations; stated that factors that control population size are war, famine, and disease. Without those factors, resources would run out.

Which scientist did this:

studied botany; stated that organisms gain & lose traits by the way they use them; these acquired traits can be passed on to offspring.

Which scientist did this:

studied geology; claimed the Earth must be very old & constantly changing.

Which scientist did this:

studied biology & claimed all species are involved in a competition for survival; those organisms who are best suited to their environment will survive and reproduce more successfully