BIOLOGY 2C03 Study Guide - Final Guide: Hemoglobin, Heterozygote Advantage, Wild Type

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blackherring683

6 Nov 2017

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Assumptions allele frequency remains stable over time allele distribution into genotype is predictable. Allele frequency: the frequency of a single allele of a gene within the whole population gene pool = all possible alleles. 2 times the number of homozygous add by 1 times the number of heterozygous p + q = 1. Genotype frequency there are 3 genotypes for gene a: aa, aa or aa if we know the allele frequency, the genotype frequencies can be determined using binomial expansion thus the formula is: How can we use this information? same way we use a punnett square to determine genotype of o springs. Mendel: patterns of inheritance for a cross bw two individuals are based upon frequencies of alleles in individuals. Bb and bb genotypes have black fur is the recessive allele and only bb genotype gives brown fur if 80% gametes carry a b allele in a pop. and 20% carry b, then:

Related Questions

11.The evolutionary force of drift changes allele frequencies more quickly in which of the following kinds of populations?

a. large populations

b. small populations

10.Larger populations generate larger numbers of mutations.

True

False

9.Overdominance can result in changes in genotype frequencies, without changes in allele frequencies.

True

False

8.Protein coding genes usually evolve faster than pseudogenes.

True

False

7.Favorable mutations are not directly induced by environmenntal conditions where they increase fitness, instead they occur by chance, and if they happen to increase fitness, their frequency will increase in a population.

True

False

6.Consider a single gene with two alleles, A and a, in a population. What is the frequency of the Aa genotypes in zygotes drawn from a gene pool where A=0.3 and a=0.7, if they are in Hardy-Weinberg proportions?

1. 0.3

2. .09

3. 0.49

4. 0.42

5. 0.7

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

azurepug898

Q1. What are alleles?Different forms of the same gene.Different genes.The different characteristics of an organism.Genes found only in humans.Q2. If you add up the frequency of homozygotes + the frequency of heterozygotes for one gene (i.e. at one locus) in a population, what number do you get?Q3. People who are heterozygous for the sickle-cell allele:Are susceptible to malaria but not sickle-cell anemia.Are susceptible to sickle-cell anemia but not malaria.Are not susceptible to either sickle-cell anemia or malaria.Are susceptible to both sickle-cecell anemia and malaria.Q4. In the case study in this lab, which genotype is represented by "2pq" in the Hardy-Weinberg equation?Homozygous HbAHomozygous HbSHeterozygous HbA/HbSNo specific genotypeQ5. Suppose that, in an isolated village, the proportion of individuals that have sickle-cell anemia is 0.1 (or 1 of every 10 people). What proportion of the population should be sickle-cell carriers, according to Hardy-Weinberg expectations?Q6. When you simulated the elimination of malaria at the beginning of the lab, once the allele frequencies stabilized, what was the frequency of the HbA allele?Q7. When you investigated regional differences, what was the frequency (over many generations) of the HbS allele in the village in the "slightly wet" part of Africa?Q8. What is the number of deaths due to sickle-cell anemia in a region without mosquitoes expected to be?Very lowVery highModerateRelated to the frequency of malaria allelesQ9. As long as there are multiple alleles of a gene in a population, why will the frequencies of the alleles always change over time?Because natural selection changes all allele frequencies in populations over time.Because genetic drift causes random fluctuations of allele frequencies in populations.Because diseases will eliminate some of the alleles, generating fluctuations in their frequencies.Because allele frequencies fluctuate before the alleles eventually become fixed.Q10. Imagine a huge population with a gene that has ten functionally equivalent, neutral alleles. A small but genetically representative group of individuals from the big population is transported to an island, forming a small population. Which of the statements below best describes what will likely happen over time, and why?Because natural selection doesn't act on neutral alleles, the frequencies in the two populations should remain the same over time.Genetic drift will cause one allele to first become fixed in the island population, and later to become fixed in the original, large population.Genetic drift will result in the allele frequencies of the two populations diverging over time, with alleles being lost sooner in the island population.The allele frequencies of the two populations will change similarly due to a combination of genetic drift natural selection.

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BIOLOGY 2C03 Study Guide - Final Guide: Hemoglobin, Heterozygote Advantage, Wild Type

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