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Biology 1001A Study Guide - Final Guide: Genotype Frequency, Allele Frequency, Frequency-Dependent Selection

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apricotsheep340
20 Apr 2013
School
Western University
Department
Biology
Course
Biology 1001A
Professor
Tom Haffie

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Document Summary

Strategy to distinguish between a phenotype that results from codominance relative to incomplete dominance. Characteristics that identify a pleiotropic allele: when two or more characters are affected by a single gene. General pathway of eukaryotic membrane protein production: dna is transcribed in nucleus ribosomes transport transcripts to. Er er translates proteins are packaged into vesicles to the. Golgi complex send protein to cell membrane. Characteristics of dominant alleles: mask effects of recessive alleles and determine phenotype, an allele is not always dominant all the time, depends on other. Which allele in a heterozygote is dominant, given biochemical mechanism of action of allele products: happens due to interaction of the gene products. Factors that affect how allele frequencies change over time in a population: no selection = allele frequencies do not change, diploidy, dominance / recessive relation, inheritance are not in themselves sufficient to drive changes in allele frequencies.

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Related Questions

1a. You discover a population of butterflies. If the alleles for spots (S) is dominant to the allele for no spots (s) and both have equal frequency in the population, how many spotted butterflies should you expect in a population of 100 individuals if it is in Hardy-Weinberg equilibrium? How many individuals are heterozygous?

1b. Within the same population of butterflies, dark blue color (B) of the wings has incomplete dominance over white wings (b). If a population of 100 butterflies is in HardyWeinberg equilibrium and has 36 dark blue individuals, what are the allele frequencies and how many white and light blue individuals would you expect to see?

I need this in 15 min!Please help!!!1

A gene in a population of sexually reproducing organisms with the following genotype frequencies is at Hardy-Weinberg Equilibrium: BB 100, Bb 800, bb 100

A) true B)false C) can not be determined

Which of the following evolutionary forces would be the best explanation for the genotype frequencies in the population in the above question?

A) genetic drift B) there are no evolutionary forces acting on this gene population C)assortive mating D) Overdominance E)Directional selection

If a population is at Hardy-Weinberg equilibrium, which of the following allele frequencies would yield the smallest number of heterozygotes? A)

A=0.25, B=0.75 B) A=0.75, B=0.25

C)A=0.50, B=0.50

D)A=0.10, B=0.90

Fixation occurs when one allele becomes the only allele for a gene in a population, meaning that all other alleles for that gene have been lost. True or false

Let’s say you are studying a population of Japanese four o’clock plants. In these plants, the allele for red color flower shows incomplete dominance over the allele for white flowers. This is very convenient for this experiment because you can distinguish the heterozygous (pink flowers) from the homozygous dominant (red flowers). For your experiment, you produced a large number of plants, 25% had red flowers, 25% had white flowers and 50% had pink flowers. Calculate the allele frequency of this population, what is the value of p & q? You transplanted them into different habitats and left some in the lab (using the same proportions in all the habitats). You waited a few years, while plants reproduce for a few generations and then you go back and resample the populations you’ve transplanted. 5. In the lab you ensured that all individuals receive all requirements to grow and reproduce and mate randomly. A) Is the lab population in Hardy-Weinberg equilibrium? Yes/No, explain B) If the population is in Hardy-Weinberg equilibrium, what do you expect the distribution of the phenotypes after a few generations breeding in the lab?