18.1 Population genetics

  • Created by: Megan2413
  • Created on: 06-03-18 21:02
What is a population?
A group of organisms from the same species occupying the same area that can interbreed
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What is a gene pool?
The total number of alleles of all the genes of all the individuals in a population at a given time
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What is allelic frequency?
The number of times an allele occurs within the gene pool compared to the total number of alleles for that trait
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What is the equation for allelic frequency?
Frequency = no. of a specific type of allele/total no. of allels in gene pool
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What five assumptions must be made when applying the Hardy-Weinberg principle?
- No mutations arise - No natural selection - No migration - Large population - Random mating
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Why must a large population be assumed?
A large population minimises the impact of chance events causing changes in allele frequencies
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Why must random mating occur for the Hardy-Weinberg principle to be applied?
It means that there were no mating preferences
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What is the Hardy-Weinberg equation?
p2 + 2pq + q2 = 1
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What does p2 stand for?
Homozygous dominant genotype
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What does 2pq stand for?
Heterozygous genotype
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What does q2 stand for?
Homozygous recessive
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In a class, 9% of students cannot roll their tongues. Tongue-rolling is a dominant characteristic. How many of the class are heterozygous?
42%
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Dalmation dogs have black or brown spots; where black is dominant to brown. If 36% of a population of dogs have black spots, what is the frequency of the two alleles?
Black (p): 0.2 Brown (q): 0.8
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What does p + q =?
1
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Card 2

Front

What is a gene pool?

Back

The total number of alleles of all the genes of all the individuals in a population at a given time

Card 3

Front

What is allelic frequency?

Back

Preview of the front of card 3

Card 4

Front

What is the equation for allelic frequency?

Back

Preview of the front of card 4

Card 5

Front

What five assumptions must be made when applying the Hardy-Weinberg principle?

Back

Preview of the front of card 5
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