Animal Genetics and Breeding Quiz 30 Quiz InstructionsThis quiz consists of 20 multiple-choice questions.You will be awarded 5 marks for each correct answer. Question 1: What are the assumptions of Hardy Weinberg equilibrium?Small population size, random mating, no selection, no migration, no mutationlarge population size, random mating, no selection, no migration, no mutationlarge population size, random mating, heterozygotes survive the best, no migration, no mutationlarge population size, like individuals mate, no selection, no migration, no mutation e. large population size, random mating, no selection, migrants enter from other populations, no mutation Question 2: Twin studies in humans are useful because:they allow more refined estimates of chromosome location to be made b twins have a greater likelihood of being heterozygousthey allow improved expression of genescloning of genes is facilitated by the presence of extra copiesthey allow genetic as opposed to environmental influences on variation in a trait to be estimated Question 3: Which of the following statements about heritability are true?is a measure of level of gene linkage is a measure of inbreedingis a measure of proportion of repeated DNA in an organismis a measure of the proportion of variation that is due to genetic causes Question 4: The allele associated with sickle cell anemia apparently reached a high frequency in some human populations due torandom matingsuperior fitness of heterozygotes in areas where malaria was presentmigration of individuals with the allele into other populationsa high mutation rate at that specific gene Question 5: . An increase in the inbreeding coefficient, F,is likely to result in:reduced likelihood of heterozygotes being present in a populationhigher proportion of genes that show linkage higher proportion of genes with intronslower level of difference between proteins in two daughter cells Question 6: Most new mutations appear to be:beneficialneutral or deleteriouspresent in homozygotes rather than heterozygotesdetectable using allozyme studies (protein electrophoresis) Question 7: If the frequency of males affected with an X-linked recessive condition in a human population is .10 (one in ten), what will be the expected frequency of affected females?0.00010.0010.010.02 Question 8: Which of the laws of Mendel is a fundamental lawLaw of DominanceLaw of SegregationLaw of Independent Assortmentall the above Question 9: Co-dominance is exemplified insickle cell anaemiaABO blood group systemboth of thesenone of these Question 10: Phenotypic Ratio in F2 in semi-lethal gene action will be1:12:13:13:2 Question 11: Which of the following is trueA bull has half of genes for milk production to that present in cowSuperiority of a bull is transmitted to all daughters but not to male calfSuperiority of a bull is because of some holandric genes for milk production that pass from bull to male calves onlyNone of these Question 12: In sex influenced traitsA bull has half of genes for the trait as compared to cowGene Expression depends on hormonal profile of the carrierThe genes are present on autosomes but their regulatory genes are present on sex chromosomesGenes are present on sex chromosomes but their regulatory mechanism is somehow governed by autosomal set of chromosomes Question 13: Exchange of segments between non-homologous chromosomes is calledRobertsonian translocationkno-how translocationexchange can occur between homologous chromosomes onlynon-hom-chrom exchange Question 14: Haemophilia is an coded bysex linked semi-lethal genesex limited semi-lethal recessive genesex linked lethal recessive genesex limited recessive lethal gene Question 15: Comb pattern in Poultry is an example ofGene interaction where typical Mendelian dihybrid ratio is observed in F2.dominant recessive epistasis modifying the ratio to 9:6:1double recessive epistasis modifying the ratio to 9:7Simple Mendelian trait governed by two genes. Question 16: X-chromosome inactivationtakes place in humans so that the same X chromosome is inactive in all of the cells of a femalenormally takes place in males but not femalesoccurs in fruit flies but not in mammalsresults in genetically turning off one of the two X chromosomes in female mammals Question 17: The greatest source of genetic variation in Animal population is fromMutationsSexual reproductionSelectionGeographic variation Question 18: During the first meiotic division (meiosis I)Homologous chromosomes separateChromosome number is reduced in halfCrossing over between nonsister chromatids occursAll of the above Question 19: An individual with the genotype of AABbCcDD can make how many different kinds of gametes24816 Question 20: Im a cross that follows a single trait, if a homozygous dominant is crossed with a heterozygote for a given trait, the offspring will be:All of the dominant phenotype¼ of the recessive phenotypeAll homozygous dominantAll homozygous recessive
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