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Chapter6and7StudyGuide
1. StateMendel’sprincipleofdominance.
2. Whatisprobability?Howdoesprobabilityrelatetogenetics?
3. Whatistheprobabilitythatacouple’sfirstchildwillbeafemale?
a. Whatistheprobabilitythatthesamecouplewillhavethreefemalesinarow?
b. Whatistheprobabilitythatthesamecoupleforthchildwillbemale?
4. Explainthetermsegregationasitappliestoallelesandtheformationofgametes.
5. Definethefollowingterms:homozygous,heterozygous,genotypeandphenotype
6. CompletethefollowingcrossinaPunnettsquare:Ppxpp
a. WhatisthegenotypicratiooftheF1generation?
b. IfthePallelerepresentspurpleflowersandthepallelesymbolizeswhiteflowers,whatisthephenotypicratio
oftheF1generation?
7. Inpeaplants,thealleleforyellowseedsisdominanttothealleleforgreenseeds.Predictthegenotypicratioof
offspringproducedbycrossingtwoparentsheterozygousforthistrait.DrawaPunnettsquaretoillustrateyour
prediction.
8. StateMendel’sprincipleofindependentassortment.
9. Acrossbetweenawhiteeyedfruitflyandaredeyedfruitflyresultsinoffspringthathavepinkeyes.Whatkindof
dominanceisrepresentedinthiscross?
10. Acrossbetweenawhitehairedcowandaredhairedbullresultsinroan,redandwhite,hairedcalves.Whatkindof
dominanceisrepresentedinthiscross?
11. IsitpossibleforacouplewithbloodtypeallelesIAiandIBitohaveoffspringwithbloodtypeA?Explainyouranswer.
12. Howdomultipleallelesandpolygenictraitsdiffer?
13. Whycanmultipleallelesprovidemanydifferentphenotypesforatrait?
14. Howmanychromosomesareinahumancell?Inahumangamete(sexcell)?
a. Howmanyofthosechromosomesdeterminesex?Whataretheycalled?
b. Whatarethechromosomesthatdonotdeterminesexcalled?
15. Colorblindnessisasex-linkeddisorder.Acouplewantstoknowthechancestheirunborndaughterwillbecolor
blind.Thefatheriscolorblindandthemotherhasnormalvision.Whatisdaughter’sprobabilityofbeingcolorblind?
ExplainyourreasoningbyusingaPunnettsquare.
16. Howdoscientistsvisualizehumanchromosomestodetectpotentialgeneticdiseaseanddisorders?
17. Howcanafamilypedigreebehelpfulindeterminingtheprobabilityofhavingachildwithageneticdisorder?
18. Whatisachromosomaldisorder?Nameonechromosomaldisorderthatcanresultfromanondisjunction.
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