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This could be anything, from earthquakes to migration to floods to disease, and so on, and so forth. In nature, population sizes naturally fluctuate even without such events, due to changes in the availability of resources, predation, and so on.
Peptic ulcer occur in stomach and duodenum. It is also occur at times in Meckel's diverticulum.
Usually a change in the envirnoment where one group will do better and the other group will move to find a new place where they can thrive.
(In biology) The bottleneck effect happens when the size of a population or even an entire species is suddenly reduced, with lasting effects on at least one generation. A population bottleneck may occur after an epidemic, drought, fire, hunting, or other destructive events.
Are small
Osteoporosis - A disease where bone and mineral density is reduced. Typically occurs in post-menopausal women, but can also occur in men.
ecological exclusion
About 16 cases of Tay-Sachs disease are diagnosed each year.
A genetic mutation within the population.
The defective gene that causes Tay-Sachs disease is found in roughly 1 in 250 people in the general population.
natural selection or genetic drift
Mutation can create new alleles, therfore can change allele frequencies in a population.
In Alzheimer's disease, CAA is more common than in the general population, and may occur in more than 80% of patients over age 60.
1. Reduced employment 2. Reduced productivity 3. Reduced prices
The 802.11g clients will operate at reduced speeds.
No, organisms die.Evolution is the change in allele frequency over time in a population of organisms.
Eye color can change with age. Slight color changes can occur from disease or a change in hormones.