TMA4/BIO403

TMA Quiz Questions TMA: TMA4/BIO403 SCORE=10.00 BIO403 - Population Genetics Dr. Chukwu Maureen (mchukwu@noun.edu.ng ) 1 The chisquare test gives us the probability that the difference between what we observed and what we expect under the Hardy Weinberg is due to ___ Mutations Genetic drift Recessiveness Chance 2 Which of the following is true of males for sex-linked traits? they are heterozygous they are hemizygous they are homozygous they are hermozygous 3 When a trait is completely recessive, both the hetrozygote and the dominant homozygote have a fitness of _____ 1 2 3 None of the above 4 Which of the following gives the contribution of each genotype to the next generation in a Hardy Weinberg population where selection occurs leading to the survival of the genotypes? The initial frequency of the genotype divided by its fitness The initial frequency of the genotype multiplied by its fitness The initial frequency of the genotype plus its fitness The initial frequency of the genotype minus its fitness 5 Which of the following best describe sexlinked traits? Traits controlled by genes located on the x-chromosomes Traits controled by genes locatedon the y-chromosomes Traits controled by geneslocated on the autosomes Traits controled by genes located on the chromatins 6 Which of the following is an important consequencies of having many alleles at a locus Most individuals in a population arae heterozygotes Most individuals in apopulation are homozygotes Most individuals in a population are cuploids Most individuals in apopulation are aneuploids 7 Which of the following is very useful in describing the gene pool? genetic frequencies phenotypic frequencies meiotic frequencies allelic frequencies 8 Hardy-Weinberg laws depend on the following assumptions except __. new mutation appear in the gene pool the population includes a very large , virtually infinite number of individuals there is no migration into or out of the population there are genotype dependent differences in the ability to survive to reproductive age and transmit gene to the next generation 9 A measure of the relative intensity of selection against a genotype is known as _____ Reproductive abaility Fitness Seection coefficient Survival 10 Which of the following is not true of natural selection? It is a relative measure of selection coefficient It is differential reproduction of genotypes It is a dominant force in the evolution of many traits Through it, traits that contribute to survival and reproduction increases over time 11 Adaptation arises chiefly from____ Genetic drift Natural selection Mutation Migration 12 Which of the following is not true of migartion? It usualy implies movement of organisms It increases the effective size of populations It reduces population divergence It does not change allelic structure 13 Recessive x-linked traits are more frequent among___ Females Hemaphrodites Males Hemizygous 14 If the alleles are sex-linked, equillibrum frequencies are approached in ____generations Several Four Two One 15 It is not possible to differentiate between homozygous dominant and heterozygous class in which of the following dominant states? complete incomplete codominance intermediate 16 The relative mobility of protein is generally a function of the following except: size charge shape of molegules molecular mass 17 In order for migration to affect the make up of the gene pool,population must differ in their ___ Allelic frequencies Genetic frequency Genetic drift Mutaion frequencies 18 The change in allelic frequency from migration depend on which of the following factors? I the proportion of of the migrants in the final population, II The difference in allelic frequency between the migrants and the residents I only II only I and III I and II 19 Which of the following forms of genetic drift has frequently been used to expalin evolution of new species? Bottle neck effetc Founder effect Point effect Small population 20 Which of the following is /are the effects of gene flow on a population? Introduces new alleles to the population IIChanges the allelic frequencies within the recipient population III Different populations remain smaller I only II only II and III all of the above