For which set of fitnesses is one of the alleles additive and beneficial? WAA = 1, WAB = 1.2, WBB = 1.3 %3D %3D WAA = 1.2, WAB = 1.1, WBB = 1 %3D WAA = 1.2, WAB = 1, WBB = 1.2 %3D WAA = 1.5, WAB = 1, WBB = 1 %3D
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- a.)If the frequency of an allele at a locus of interest is 0.57, what is the frequency of the genotype that is homozygous for this allele (that is, that genotype has two copies of this allele)? b.) If we know that the frequency of an allele at a locus of interest is 0.57, we have enough information to calculate the frequency of the related phenotypes in the population, assuming there are only two alleles.How Can We Measure Allele Frequencies in Populations? The MN blood group is a single-gene, two-allele system in which each allele is codominant. Why are such codominant alleles ideal for studies of allele frequencies in a population?If 120 of 200 alleles are dominant alleles, then what percentage of the alleles are dominant alleles? A-12% B-40% C-60% D-120% What percentage of the alleles are recessive alleles? E-8% F-40% G-60% H-80% Which of the terms of the Hardy-Weinberg equations represents the frequency of the recessive allele in the gene pool? A-p^2 B-p C-2pq D-q^2
- . In pea plants, height is controlled by a Dominant Allele (T) for Tall Height and by a Recessive Allele (t) for Short Height. If 96% of a population of pea plants have the tall phenotype, calculate the frequencies of dominant allele (T) & recessive (t) alleles. Out of the 96%, what is the estimation of how many are homozygous dominant vs. heterozygous? What is the frequency of the recessive phenotype?If the frequency of an allele at a locus of interest is 0.57, and we know there are only two alleles at this locus, what must be the frequency of the other allele?In corn, yellow kernel color is governed by a dominant allele for white color, W, and by its recessive allele, w, . A random sample of 100 kernels from a population that is in equilibrium reveals that 9 are yellow and 91 are white. What are the frequencies of the yellow and white alleles in this population? What is the percentage of the heterozygotes?
- Which of the following statements about quantitative genetics is TRUE? Heritability is the measure of the proportion of an individual's phenotype that is due to genetics. QTL mapping provides an overestimate of the number of genes contributing to a quantitative trait. A threshold trait is measured in whole numbers. An H2 value (broad-sense heritability) that approaches 0.0 means that almost all the phenotypic variation is determined by genetic differences. The h2 (narrow-sense heritability) value is a prediction of the impact that selection may have in altering an initial population by artificial selection.We have learned that the response to selection is equal to the selection differential times the narrow-sense heritability, and that the narrowsense heritability includes only the additive genetic variance. Why aren’t the dominance genetic variance and the gene interaction variance included? Why don’t they contribute to the genetic variation that is acted on by selection?In your own words describe why we should use both samples to estimate the variance of the population when working with an independent two-sample design?
- In a population of 10,000 individuals, where 3600 are MM, 1600 are Mm, and 4800 are mm, what are the frequencies of the M alleles and the m alleles?You are a rabbit breeder, and you decide that you want rabbits with long fur. Thephenotypic variance of fur length is 4 cm2. The covariance of fur length between betweenfull sibs is 1 cm2. The mean fur length in the initial population is 3 cm. You choose to breedthe top 1/3 of the population with the longest fur, and their mean fur length is 5 cm. Assumethat the covariance between sibs is due to only additive genetic variance.a) What is the narrow sense heritability (h^2 ) of fur length?b) What do you expect the mean fur length to be in the progeny of rabbits you breed?c) How many generations of this selection regime will it take for the mean fur length of thepopulation to be 10 cm? (Assume heritability and additive genetic variance remainunchanged throughout this process.)The table below records information on a gene with two alleles, Z and Y, in four different populations. Use this information to answer the following questions. Based on the table, which of the following statements is true? Population Frequency of allele Z Population size Fitness of ZZ Fitness of ZY Fitness of YY A 1.0 200 0.84 0.84 1.0 B 0 320,000 0.84 0.84 1.0 C 0.93 130,000 0.84 0.84 1.0 D 0.99 1,450,000 1.0 1.0 0.62 A.) populations C's allele frequencies are mainly driven by genetic drift B.) Mutation rates are high in population D C.) natural selection is favoring allele A in population C D.) migration is occuring between populations C and D