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Transcript
11.1 Genetic Variation Within Population
KEY CONCEPT
A population shares a common gene pool.
All the individuals of a species that live in the same area.
11.1 Genetic Variation Within Population
Genetic variation in a population increases the chance
that some individuals will survive.
• Genetic variation leads to phenotypic variation.
• Phenotypic variation is necessary for natural selection.
• Genetic variation is stored in a population’s gene pool.
– made up of all alleles in a population
– allele combinations form when organisms have
offspring
11.1 Genetic Variation Within Population
• Allele frequencies measure genetic variation.
– measures how common allele is in population
– can be calculated for each allele in gene pool
11.1 Genetic Variation Within Population
Genetic variation comes from several sources.
• Mutation is a random change in the DNA of a gene.
– can form new allele
– can be passed on to
offspring if in
reproductive cells
• Recombination forms new combinations of alleles.
– usually occurs during meiosis when
parents’ alleles
arranged in new
ways in gametes
11.1 Genetic Variation Within Population
Genetic variation comes from several sources.
• Hybridization is the crossing of two different species.
– occurs when individuals can’t find mate of own
species
– topic of current scientific research
11.1 Genetic Variation Within Population
Section Questions-Under your Power Notes
1. Why does genetic variation increase the chance that some
individuals in a population will survive?
2. Describe two main sources of genetic variation.
3. In what way is a gene pool representative of a population?
4. If a certain trait’s allele frequency is 100 percent, describe
the genetic variation for that trait in the population.
5. How does crossing over during meiosis provide a source of
genetic variation? Draw a diagram to show this process.