BIOL239 Lecture Notes - Lecture 10: Population Genetics, Allele Frequency, Genotype

89 views4 pages

violetporcupine96

7 Dec 2018

School

University of Waterloo

Department

Biology

Course

BIOL239

Professor

Laura Lemieux

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Phenotypic: proportion of individuals in a population with a particular phenotype. Genotypic: proportion of individuals in a population with a particular genotype. Allele: proportion of all copies of a gene in a population that are of a given allele type. P 2 + 2pq + q 2 = 1. Calculating allele frequencies p (a) = (2452 (2) + 45) / 5000 p (a) = 0. 99 q (a) = (3 (2) + 45) / 5000 q (a) = 0. 01 (0. 99) 2 + 2 (0. 99) (0. 01) + (0. 01) 2 = 1. Hardy-weinberg equilibrium (assume the founding generation is in equilibrium) Aa: 2 (0. 99) (0. 01) = 0. 019 aa: (0. 01) 2 = 0. 0001. First generation (expected number of individuals is 2500) Aa: 0. 019 x 2500 = 47. 5 aa: 0. 0001 x 2500 = 0. 25. Since the genotypic frequencies of the first generation are almost identical to the frequencies in the founding population, the founding population is in h-w equilibrium.

Related Questions

Under the Hardy-Weinberg model, a population will reach Hardy-Weinberg frequencies in a single generation. This model assumes that genotype frequencies are the same in both sexes: Consider a situation where this is not the case. A researcher creates a new Drosophila population by selecting 2000 males from a stock population fixed for the dominant A allele at a neutral locus A and 2000 females from a different stock population fixed for the recessive a allele at the A locus. The A allele is located on an autosome, not a sex chromosome. These individuals then mate among themselves.

a) Assuming that there is no mutation, what genotype frequencies will be observed in the first offspring generation?

b) How long will it take this population to reach Hardy-Weinberg proportions?

c) Explain why this population took two generations instead of one to reach Hardy-Weinberg equilibrium.

oliveeagle546

Rank the following terms in increasing order of scale accordingto your knowledge of their definitions:

-Locus
-Allele
-Chromosome
-Gene

If 16% of a population expressed a recessive trait, whatpercentage of the gene pool is the dominant allele?

Consider a population of Peach-faced lovebirds where:

65% of all gametes carry a dominant allele (F)for regular plumage (feather colors).

The remaining 35% carry the recessive allele(f) for a plumage with white.

When two heterozygous (Ff) individuals breed,we expect the genotype Ff to account for_____% ofthe new generation.

In the case of a species of sea lions displaying assortativemating (where individuals prefer to mate with individuals that looklike them), the conditions for Hardy-Weinberg Equilibrium are stillmet and supported (T or F)

If 90% of the alleles in a population are dominant, what is theratio of genotypes?

What are genes comprised of?

In the Hardy-Weinberg equation, what does 2pq denote?

Without strong natural selection, recessive alleles willinevitable disappear from a population T or F

If the proportion of sickle-cell sufferers(HbS-HbS homozygotes) in a population is 0.04,according to the Hardy-Weinberg equation, what is the proportion ofsickle-cell carriers (HbS-HbA heterozygotes) in thatpopulation?

coralherring96

II think this is a pretty basic Hardy-Weinberg Problem, I justdon;t know how to solve it yet. Thank you for your help!

Assume a population of 800 individuals with the followinggenotypes:452 AA, 296 Aa, and 52 aa. This is the 1stgeneration.

a. Calculate the frequencies for A___ and a___. Do this fromgenotype frequencies (do NOT assume Hardy Weinberg Equilibrium)

b. Use the allele frequencies from part a to calculate theexpected genotype frequencies for AA___ Aa___ and aa__

c. Based on your allele frequencies above, how many of eachgenotype would you expect if the population of 800 people were inHardy-Weinberg Equilibrium? AA____ Aa____aa____

d. Suppose that the original population (452 AA; 296 Aa; 52 aa)experienced an epidemic of an infectious disease that kills 75% ofeach homzygous class ( AA and aa). and 25% of the heterozygotes.How many of each genotype would survive?

e. The results of part e are still the first generation, butpost-epidemic survivors. What are the new allele frequencies?

f. Assume the 1st generation post-epidemic survivors materandomly, and there is no selection, no migration, no mutation, nogenetic drift. What frequency of each genotype is expected in the2nd generation?

g. If the 2nd generation contains 350 indivduals how many ofeach genotype do you expect?

cerisekangaroo944

BIOL239 Lecture Notes - Lecture 10: Population Genetics, Allele Frequency, Genotype

Document Summary

Get access

Related Documents

BIOL239 Lecture Notes - Lecture 18: Genotype Frequency, Allele Frequency, Population Genetics

BIOL239 Study Guide - Quiz Guide: Genotype Frequency, Albinism, Penetrance

BIOL239 Lecture Notes - Allele Frequency, Genetic Drift, Population Bottleneck

Related Questions