Gene Pools Flashcards
What is the Founder effect
The Founder effect refers to the situation in which a sample of a population moves into a new area. The resulting population reflects the sample of genes from the original ‘founding’ population.
What does the Founder effect do?
The Founder effect reduces the variety of genes in gene pools as the population is established by a sample of individuals from the original population and they only carry a sample of the genes from the original population.
What is gene frequency?
Gene frequency refers to the percentage of members of a population with a particular allele.
What causes the Tay-Sachs disease?
Tay-Sachs is due to a mutation that affects a metabolic pathway .
Discuss Darwin’s Theory of a Natural Selection
- Natural populations tend to produce lots of offspring
- Variation occurs between members of a population
- All members of a population compete for food, shelter and mates
- some organisms within the population are better suited to the environment than others
- This is due to the variations which make them more suited to the environment
- The more suited organisms survive and reproduce and pass their favourable features onto their offspring
- The organisms with unsuitable or favourable features die out
- Organisms with suitable or favourable features gradually increase in number in the population
- this is ‘survival of the fittest’
How does natural selection affect gene frequency in a population?
Over time the most favourable features become more common in the population
The genes responsible for the favourable features increase in frequency
Variation in the population decreases
Natural selection reduces gene frequency in a population
What causes the Tay-Sachs disease?
Tay-Sachs is due to a mutation that affects a metabolic pathway .
Discuss Darwin’s Theory of a Natural Selection
- Natural populations tend to produce lots of offspring
- Variation occurs between members of a population
- All members of a population compete for food, shelter and mates
- some organisms within the population are better suited to the environment than others
- This is due to the variations which make them more suited to the environment
- The more suited organisms survive and reproduce and pass their favourable features onto their offspring
- The organisms with unsuitable or favourable features die out
- Organisms with suitable or favourable features gradually increase in number in the population
- this is ‘survival of the fittest’
How does natural selection affect gene frequency in a population?
Over time the most favourable features become more common in the population
The genes responsible for the favourable features increase in frequency
Variation in the population decreases
Natural selection reduces gene frequency in a population
