Genetics Second Canadian Edition Test Bank

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11.The first generation of offspring from the parents is calledA.P.B.F1.C.F2.D.testcross.E.backcross.2.Which of the following terms is not a type of mating cross?A.reciprocalB.testcrossC.monohybridD.dihybridE.dominant3.A _____________ is a cross between an unknown and a homozygous recessive.A.testcrossB.dihybridC.monohybridD.backcrossE.controlled4.If an individual has 10 gene pairs, howmany different gametes can be formed if three of the genepairs are homozygous and the remaining seven gene pairs are heterozygous?A.49B.100C.128D.1024E.131,072

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5.If the parents of a family already have two boys, what isthe probability that the next two offspringwill be girls?A.1B.1/2C.1/3D.1/4E.1/86.In some genetically engineered corn plants, a dominant gene (BT) produces a protein that islethal to certain flying insect pests thateat the corn plants. It was also found that the pollen couldcause death in some flying insects. If the corn plant is heterozygous for BT, what proportion of thepollen would carry the dominant gene?A.all pollenB.1/2C.1/3D.1/4E.1/87.Suppose that in plants, smooth seeds (S) are dominant to wrinkled seeds (s) and tall plants (T)are dominant to short plants (t). A tall plant with smooth seeds was backcrossed to a parent thatwas short and wrinkled. Assuming independent assortment, what proportion of the progeny isexpected to be homozygous for short and wrinkled?A.1/2B.1/4C.1/8D.1/16E.08.A rare recessive trait in a pedigree is indicated by which pattern of inheritance?A.verticalB.horizontalC.diagonalD.both vertical and horizontalE.father to daughter inheritance

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9.Sickle cell anaemia is a recessive trait in humans. The gene that causes this disease is notlocated on the sexchromosomes. In a cross between a father who has sickle cell anaemia and amother who is heterozygous for the gene, what is the probability that their first three children willhave the normal phenotype?A.1/4B.1/2C.noneD.1/8E.1/16 will be albino10.A dominant trait, Huntington disease, causes severe neural/brain damage at approximately age40. The gene that causes this disease is not located on the sex chromosomes. A female whosemother has Huntington disease marries a male whose parents are normal. It is not known if thefemale has the disease. Assuming the female's mother was a heterozygote, and her father wasnormal, what is the probability that their firstborn will inherit the gene that causes Huntingtondisease?A.25%B.50%C.75%D.100%E.0%11.In a monohybrid crossAA×aa, what proportion of homozygotes is expected among the F2offspring?A.1/4B.1/2C.3/4D.All are homozygotes.E.None are homozygotes.

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12.Anallele that expresses its phenotype even when heterozygous with a recessive allele is termedA.recessive.B.recombinant.C.dominant.D.D)parental.E.independent.13.Assume that in guinea pigs, dark brown fur (B) isdominant to black fur (b). If you mate a blackguinea pig with a homozygous brown guinea pig, what proportion of the progeny will behomozygous?A.noneB.1/4C.1/2D.3/4E.all14.In the dihybrid crossAaBb×aabb, whatproportion of individuals are expected to be homozygoticfor both genes in the F1generation?A.1/4B.1/2C.3/4D.All are homozygotes.E.None are homozygotes.15.______ is/are a cross(es) between parents that differ in onlyone trait.A.Self-fertilizationB.Cross fertilizationC.Monohybrid crossesD.Artificial selectionE.Reciprocal crosses

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16.Assuming independent assortment, which of the crosses below will produce a 1:1 phenotypicratio amongthe F1progeny?A.AABB×aabbB.AaBb×AaBbC.AaBb×aabbD.AaBB×aaBBE.AAbb×aaBB17.The actual alleles present in an individual make up the individual'sA.recombinant types.B.zygote.C.dominant allele.D.allele.E.genotype.18.In a dihybrid crossAAbb×aaBB, what proportion of the F2offspring is expected to behomozygotic for at least one gene?A.1/4B.1/2C.3/4D.All are homozygotes.E.None arehomozygotes.19.A phenotype reflecting a new combination of genes occurring during gamete formation is calledA.a recombinant type.B.an independent assortment.C.heterozygous.D.homozygous.E.a multihybrid cross.

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20.Assume that in guinea pigs, dark brown fur (B) is dominant to black fur (b). If you mate ahomozygous black guinea pig with a heterozygous brown guinea pig, what proportion of theprogeny will be black?A.noneB.1/4C.1/2D.3/4E.all21.The diploid cell formed by the fertilization of the egg by the sperm during sexual reproduction is aA.reciprocal.B.zygote.C.dihybrid.D.gamete.E.monohybrid.22.In a dihybrid cross for which the parental cross isAABB×aabb, what proportion of F2offspringwill be heterozygous for both genes? Assume independent assortment.A.1/4B.1/2C.3/4D.All are heterozygotes.E.None areheterozygotes.23.An alternative form of a single gene is known asA.parental.B.dihybrid.C.reciprocal.D.allele.E.recessive.

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24.Assume that in guinea pigs, dark brown fur (B) is dominant to black fur (b). If youmate ahomozygous black guinea pig with a homozygous brown guinea pig, what proportion of theprogeny will be heterozygous?A.noneB.1/4C.1/2D.3/4E.all25.Which of the crosses listed below will give a 1:1:1:1genotypic ratio in the F1generation? Assumeindependent assortment.A.AABB×aabbB.AaBb×AaBbC.AaBb×aabbD.AaBB×aaBBE.AAbb×aaBB26.For the crossAaBb×aabb, what proportion of F1offspring will be heterozygous for both genepairs? Assume independent assortment.A.1/4B.1/2C.3/4D.All are heterozygotes.E.None are heterozygotes.27.The purposeful control over mating by choice of parents for the nextgeneration is calledA.artificial selectionB.natural selectionC.mutationD.evolutionE.random selection

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28.When both egg and pollen from the same plant produce a zygote, the process is calledA.cross-pollinationB.outcrossingC.self-fertilizationD.recombinationE.trans-pollination29.Which of the following was not involved in the rediscovery of Mendel's work?A.CorrensB.de VriesC.TschermakD.MorganE.Watson30.What does a vertical pattern of inheritance in a pedigree likely indicate?A.rare recessive traitB.rare dominant traitC.mulitgenic inheritanceD.environmental impactE.common recessive trait31.Calculate the probability of either all-dominant or all-recessive genotypes for the alleles A, B, E,and F in the following cross:AaBbccddEeFf×AaBbCcddEeFfA.1/32B.1/16C.1/64D.1/128E.1/256

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32.In some plants, a purplepigment is synthesized from a colourless precursor. In a cross betweentwo plants, one purple and the other colourless, an F1generation was produced that was all-purple. The F2produced from the F1had 775 purple, 200 red, and 65 colourless. What is thegenotype of the parents?A.AABB×AABBB.AABB×aabbC.aabb×aabbD.aaBB×aabbE.AAbb×aabb33.Lines that produce offspring carrying specific parental traits that remain constant from generationto generation are calledA.maternalB.indeterminateC.heterozygousD.pure-breedingE.wild-type34.After a cross between two corn plants, the F1plants all had a dwarfed phenotype. The F2consisted of 1,207 dwarf plants and 401 tall plants. Identify the phenotypes and genotypes of thetwo parents.A.DD(dwarf),dd(tall)B.DD(tall),dd(dwarf)C.dd(dwarf),dd(tall)D.DD(dwarf),DD(tall)E.dd(dwarf),Dd(tall)

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35.Rosy coloured eyes and forked bristles are unlinked, recessive traits in Drosophila. A rosy-eyedDrosophila with wild-type bristles was crossed with a forked Drosophila with wild-type eyes. All ofthe F1were phenotypically wild-type for both traits, whereas the F2consisted of 306 wild-type, 94rosy-eyed, 102 fork-bristled, and 33 forked-bristled and rosy-eyed flies. Infer the genotypes of theparents.A.rrff,RRFFB.Rrff,rrFfC.RRFF,RRFFD.rrff,rrffE.RRff,rrFF36.Which of the following is not a phenotypic description of allele interactions affecting theexpression of traits?A.incomplete dominanceB.codominanceC.polymorphicD.multifactorialE.pleiotropic37.An interaction between non-allelic genes that results in the masking of expression of a phenotypeisA.epistasis.B.epigenetic.C.dominance.D.codominance.E.incomplete dominance.38.Which of the following diseases show pleiotropism?A.albinismB.muscular dystrophyC.colour blindnessD.sickle cell anaemiaE.male pattern baldness

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39.A deviation from normal Mendelian ratios, which may be resolved bycounting and/or controlledcrosses, is seen in which of the following terms?A.pleiotropyB.codominanceC.incomplete dominanceD.complete dominanceE.penetrance and expressivity40.Which of the following phenotypic ratiosshow incomplete dominance?A.2:1B.3:1C.1:2:1D.1:1E.4:141.Which of the following ratios show codominance?A.2:1B.3:1C.1:2:1D.1:1E.4:142.Which of the following ratios indicates a lethalgene?A.2:1B.3:1C.1:2:1D.1:1E.4:1

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43.A person who has type O blood hasA.anti-A antibodies.B.anti-B antibodies.C.anti-AB antibodies.D.both anti-A and-B antibodies.E.no surface antigens.44.If two or more forms of the same gene exist, the different forms are calledA.incomplete dominance.B.penetrance and expressivity.C.pleiotropic.D.alleles.E.dihybrid.45.The blood groups A, B, and O are different types ofA.incomplete dominance.B.penetrance and expressivity.C.pleiotropy.D.alleles.E.heterozygotes.46.The blood groups A, B, and O showA.complete dominance.B.recessiveness.C.codominance.D.completedominance, recessiveness, and codominance.E.None of the choices are correct.

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47.Which of the following monohybrid ratios can describe incomplete dominance and codominance?A.2:1B.3:1C.1:3D.1:2:1E.4:148.Which ofthe following ratios demonstrate gene interaction?A.2:1B.3:1C.1:2:1D.9:3:4E.1:349.A _____________ results whenever the nucleotide sequence is changed.A.phenotypeB.genotypeC.mutationD.traitE.character50.When the same gene is related to respiratory problems and sterility, it can be described asA.pleiotropy.B.codominance.C.incomplete dominance.D.complete dominance.E.penetrance and expressivity.

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51.Another name for a normal gene isA.wild-type.B.pleiotropy.C.dominant.D.codominant.E.recessive.52.The phenotypic ratio 1:2:1 may indicateA.complete dominance.B.codominance.C.epistasis.D.recessive lethal.E.codominance and epistasis.53.The phenotypic ratio 3:1 may indicateA.complete dominance.B.codominance.C.epistasis.D.incomplete dominance.E.codominance and epistasis.54.The phenotypicratio 2:1 may indicateA.complete dominance.B.codominance.C.epistasis.D.recessive lethal.E.codominance and epistasis.

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55.The phenotypic ratio 9:7 may indicateA.complete dominance.B.codominance.C.epistasis.D.recessive lethal.E.complementary gene action.56.The phenotypic ratio 9:3:4 may indicateA.complete dominance.B.codominance.C.epistasis.D.recessive lethal.E.codominance and epistasis.57.Which of the following phenotypic ratios show independent assortment?A.9:3:3:1B.9:7C.9:3:4D.13:3E.All of the choices are correct.58.Temperature sensitive (ts) alleles of the Drosophilashibiregene were isolated by David Suzuki.Under permissive conditions, what is the phenotype of flies homozygous for thetsalleles?A.lethalB.conditional on other factorsC.indistinguishablefrom wild-typeD.continuously variableE.co-dominant

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