1.6 Evolution
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is evolution a scientific theory
yes
a scientific theory is a…
well- substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment
scientific theory examples
gravity big bang theory
steps for developing scientific theories
• completed through reasoning or inferences of data • testing - observations of the natural world • peer review
evolution is…
the genetic changes in a population over a very long period of time
a population is
a group of a particular species living in the same geographical area at the same time
within a species there is genetic variation within the…
gene pool
a gene pool is…
all the different types of genes in a population
individuals have the same number of genes but different …
alleles
evolution can take place through five key mechanisms which…
change the genetic make-up of a population by increasing the variation or selecting for the variation
what are the mechanisms for evolution
• mutation • sexual reproduction • gene flow • genetic drift • natural selection
mutations give rise to…
new alleles
mutations increase the genetic variation within a population if…
the mutation is advantageous
harmful mutations are often not…
passed on
meiosis creates…
new four identical haploid daughter cells
in non-random mating, certain traits (alleles) are…
selected for
sexual reproduction increases…
variation to populations
gene flow is the movement of…
genetic information from one population to another of the same species
gene flow increases…
genetic variation within populations
genetic drift is the…
random change in an allele frequency in a population
do natural disasters increase or decrease numbers in a population
decrease
do phenotypes of individuals assist their survival, or is it by chance
by chance
natural selection is…
the principal mechanism for evolution
natural selection relies on…
variation being in the gene pool of population and a selection pressure acting on it