TMA1/BIO301

My TMA Home TMA Results My Pending TMA Quick Help My TMATMA InstructionCourse DetailTMA CalendarGrading Message BoardQuick InfoInstructor Message Quiz NoteQuiz Tip - 1Quix Tip - 2 TMA Quiz Questions   TMA: TMA1/BIO301 score=10.00 BIO301 - Genetics 2 Dr. Chukwu Maureen (mchukwu@noun.edu.ng )   1 The following are the role of structural chromosomal aberration in plant breeding except: they have evolutionary significance they produce semi sterile plants with low seed set they utilize vigour they are useful in genome analysis 2 The integratioh of a chromosome segment into a non homologous chromosome is called __. inversion duplication translocation deletion 3 The following are genetic consequencies of inversion except: simple inversion have primary effects on the chromosome a peculiar kind of position effect occurs due to suppresssion of the transcription of genes normal linear pairing of homologous chromosomes is not possible heterozygosity will be maintained from generation to generation 4 Which of the following types of chromosomal aberration involve two breaks followed by reunion of intestitialsegment in a reverse order? duplications inversions repeats deletions play an important role in species formation 5 Which of the following is not true of duplications? they are not as harmful as deletions some of them are useful in evolution of new genetic materials large duplications can increase fertility the phenotype may be altered 6 The following are types of duplications except: tandem reverse tandem multidisplaced displaced 7 Who fiist reported deletion in Drosophila? Wrght Price Smith Bridges 8 Which of the following is not true of deletions? organisms with homozygoue deletions survive to an adult stage deficiencies heterozygotes can be tolerated by the organisms in the presence of deficiency, a recessive allele will behave like a dominant allele deletions play an important role in species formation 9 Cytogenetics is the study of study of __. genes chromosomes alleles phenotypes 10 Which of the following best describe genetic grift? a change in genotypic frequency a change in gene pool a change in phenotypic frequency a change in allelic frequency 11 What are viewed as major factors in the evolution of genetic complexity? I. genetic drift, II. mutation, III. selection I and II II and III I and III all of the above 12 Who first demonstrated the power of selection due to ecological factors? Fisher Wrght Ford Chetverikov 13 Who helped to bridge the division between the foundations of microevolution developed by the population geneticists and the patterns of macroevolution orserved by field biologists? Dobzhansky Morgan Chetverikov Wright 14 Hardy-Weinberg equilibrium refers to __. stability of genotypic frquencies over time stability of allelic frquencies over time stability of phenotypic frquencies over time stability of gene pool over time 15 Accordint to Hardy-Weinberg principles, the frequencies of alleles will remain constant in the absence of __. I. selection, II. mutation, III.genetic drift. I and II II and III I and III all of the above 16 Natural selection will only cause evolution if : blending inheritance high proportion of genes in the gene pool allelic frequency is high enough genetic variation in a population 17 The following are reasons for studying populations and gene frequencies except: genetic variability is necessary for evolutionary success measuring frequency variations among alleles in a population variability of phenotypic and molecular traits are analyzed measuring genetic variabilty at many loci can characterize a population 18 Who among the following was heavily influenced by the writings of Fisher? Price Smith Lewontin Hamilton 19 Who applied statistical analysis to real-world examples of natural selection? Fisher Haldane Wrght Kimura 20 Which of the following is not true of a sexual population? all members belong to the same species all members live near each other any pair of members can breed together the members are isolated from each other