TMA1/BIO403

TMA Quiz Questions TMA: TMA1/BIO403 SCORE=9.50 BIO403 - Population Genetics Dr. Chukwu Maureen (mchukwu@noun.edu.ng ) 1 In which of the following situations is it impossible to determine allelic and phenotypic frequencies from actual counts? incomplete dominance codominance complete dominance intermediate domonance 2 When do changes in allelic frequencies take place due to chance alone? I. when population was small, II. when alleles are rare III. when the genotype is heterzygous I and II II and III I and III all of the above 3 Which of the following will change zygotic combinations but not the alleles that pass from one generation to the next? I. assortive mating, II. out breeding , III. inbreeding. I only II only I and III II and III 4 Which of the following is true of males for sex-linked traits? they are heterozygous they are hemizygous they are homozygous they are hermozygous 5 At which of the following dominant state(s) is it possible to distinguish the different genotypes possible at a particular locus? I. complete, II. incomplete III. codominance I only II only II and III I and III 6 Which of the following is altered by deviations from random mating in population genetics? gene pool genetic frequencies allelic frequencies genetic drift 7 The mating of genetically unrelated individuals is known as __. assortive mating inbreeding dissassortive mating out breeding 8 Which of the following is very useful in describing the gene pool? genetic frequencies phenotypic frequencies meiotic frequencies allelic frequencies 9 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 10 In a population of 1000 diploid individuals with 353AA, 494Aa and 153aa individuals, calculate the allelic frequency of A. 0.5 0.4 0.6 0.7 11 Almost all mathematical foundations of genetics changes in populations were developed during: I. 1920s, II. 1930s, III. 1940s I and II II and III I and III all of the above 12 If 57% of pupils in a population have black hair, what is the frequency of black hair in the population? 0.43 0.57 0.47 0.53 13 Which of the following best describes a gene pool? alleles among the members of a population from which genes can be withdrawn alleles among the reproductive members of a population from which gametes can be drawn alleles that occur at a group of closely linked genes alleles that occur in higher frequencies 14 It is not possible to differentiate between homozygous dominant and heterozygous class in which of the following dominant states? complete incomplete codominance intermediate 15 The relative mobility of protein is generally a function of the following except: size charge shape of molegules molecular mass 16 At what frequency do most allele that cause genetic disease in human occur? very low high higher moderate 17 The following are variations in chromosome structure except__. abbrations deletions replicatiopns inversions 18 Who initiated one of the most thoroughly studied example of chromosomal variation? Fisher Mendel Dobzhansky Wright 19 Excitement has arisen in the field of population genetics since 1960s in all but one of the following fronts: the high speed computer has made it possible to do a large amount of arithmetics in a very short time electrophoresis has provided a means of gathering a large amount of empirical data newer techniques of molecular genetics are being used to analyze the relationships among species populations being different with respect to genotypic frequency and allelic frequency 20 The following are involved in the development of the mathematical foundations of genetic changes except __. Fisher Wright Mendel Haldane