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Darwin's Theory And Natural Selection (Population Increase is…
Darwin's Theory And Natural Selection
Population Increase is Geometric
Paramecium reproduce every 24 hrs
bacteria reproduces every 20 mins
Means : 2x2x2x2=16
Food resource and space is limited
Increase is arithmetic
means : 2+2+2+2=8
Struggle for existance
Intra specific
Intraspecific competition is an interaction in population ecology, whereby members of the same species compete for limited resources
inter specific
Interspecific competition, in ecology, is a form of competition in which individuals of different species compete for the same resources in an ecosystem (e.g. food or living space).
environmental
the competition in nature among organisms of a population to maintain themselves in a given environment and to survive to reproduce others of their kind.
Variation in a population
Continuous
slow & due to recombination
discontinuous
Sudden & caused due to mutation
Survival of the fittest
Inheritence of useful variation
speciation