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test bank ch2.pdf

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University of Toronto Scarborough
Chandan Narayan

ch2Student 1The inherited material an infant receives from its parents is referred to as onesAancestral characteristicsBgenotypeCphysical and behavioural characteristicsDphenotype2The observable and measurable expression of your genetic makeup is known as yourAancestral characteristicsBgenotypeCphysical characteristicsDphenotype3Your red hair is an example of Ayour genotypeByour phenotypeCyour reaction rangeDa dominant trait4The expression of the genotype isAmodifiable by a variety of environmental factorsBnot modifiable by environmental factorsCof little concern to psychologistsDonly known at the infants birth5The smallest of all human cells is theAovumBspermCDNADneuron6The way a persons genotype is expressed in observable characteristics isAthe chromosomal trendBa phenotypeCan alleleDtheir genetic inheritance7Each ovum and each sperm containA23 pairs of chromosomesB23 chromosomesC46 chromosomesD46 pairs of chromosomes8The process of mitosis is responsible for cell division of theAgerm cellsBzygotesCbody cellsDchromosomes9Meiosis isAunique to sex chromosomesBa form of cell division in which the 23 chromosome pairs are halvedCunique to body cellsDa form of cell duplication in which the 23 chromosome pairs are doubled10Crossing over occursAduring mitosisBduring meiosisConly in the ovumDduring fertilization11The process by which equivalent sections of homologous chromosomes randomly switch places is known asAmitosisBcrossing overCmeiosisDgene splicing12The 22 pairs of chromosomes that are possessed equally by males and females areAsex chromosomesBautosomesCzygotesDgerm cells13The basic units of hereditary transmission that code for the production of certain kinds of proteins areAova and spermBchromosomesCgenesDDNA molecules14 are structural substances that serve functions such as triggering chemical reactions regulating genes and providing cells with their characteristic physical propertiesACarbohydratesBFatsCProteinsDSugars15Activation of a gene for a particular disorder may depend onAhormonesBsignals in the environmentCneurotransmitters in the brainDblood enzymes16Two or more alternative forms of the gene are known asAchromosomesBrecessiveCheterozygousDalleles17Ones outward appearance is the same as ones genetic makeup only if the genetic makeup for that trait isAheterozygousBhomozygousCcodominantDdominant18If you possess blood type AB those alleles areArecessiveBdominantCcodominantDhomozygous19You and your partner are expecting your first baby and are wondering who your baby will resemble You have curly dark hair ie homozygous while your partner has straight light coloured hair The phenotype for your child will beAcurly light coloured hairBstraight dark hairCcurly dark hairDstraight light coloured hair20Your sister has normally clotting blood but is a carrier for hemophilia If she has children who is most likely to be affected with this disorderAHer female children are more likely to be affectedBNone of her children will be affectedCHer male children will all have the disorderDIt depends on whether the childs father has an allele for hemophilia21Xlinked characteristics are more common in males than in females becauseAmales receive no counteracting gene from their fatherBthe Y chromosome is a modifier geneCmale hormones trigger the release of Xlinked characteristicsDthe absence of female hormones triggers the release of Xlinked characteristics22Genes which influence the expression of other genes are calledAmodifier genesBinfluential genesCdominant genesDXlinked genes23Geniuses are born to parents of average intelligence because of the presence ofAa single allele that determines giftednessBa particular Xlinked geneCa particular configuration of many genes all interacting with each otherDhybrid genes24Cataracts are a trait that is influenced by a dominant gene and byAmaternal ageBgenotypeCphenotypeDa modifier gene25What is the most probable parental genetic scenario for a child diagnosed with PKUAPp PPBonly the mother is a carrierCPp PpDPP PP26Phenylketonuria PKU results fromAthe inability to metabolize phenylalanineBthe inability to tolerate milkCa decrease of phenylpyruvic acid in the bodyDan excess of enzymes necessary to metabolize proteins27Research into dietary interventions for PKU indicates thatAtreatment should begin by age 2 yearsBearly deficits can be eliminated by dietary intervention at any point during the first yearCthe special diet should be discontinued in middle childhoodDtreatment should begin at birth
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