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Chapter2.PatternsandinheritanceCrossesweremadebetweentwopurelinesofrabbits,AandB.AmalefromlineAwasmatedwithafemalefromlineB,andtheF1rabbitsweresubsequentlyintercrossed（F1间杂交，相当于自交）toproduceanF2.Itwasdiscoveredthat3/4oftheF2animalshadwhitesubcutaneousfat(皮下脂肪),and1/4hadyellowsubcutaneousfat.Later,theF1wasexaminedandwasfoundtohavewhitefat.Severalyearslater,anattemptwasmadetorepeattheexperimentbyusingthesamemalefromlineAandsamefemalefromlineB.Thistime,theF1andalltheF2(22animals)hadwhitefat.Theonlydifferencebetweentheoriginalexperimentandtherepeatthatseemedrelevantwasthat,intheoriginal,alltheanimalswerefedfreshvegetables,and,intherepeat,theywerefedcommercialrabbitchow(兔子专用食品).Provideanexplanationforthedifferenceandatestofyouridea.(hint:ofteninscience,anunexpectedobservationcanleadtoanovelprinciple,and,ratherthanmovingontosomethingelse,itisusefultotrytoexplaintheinconsistency.Sowhydidthe3:1ratiodisappeared?)Ararehumandiseaseafflicted（折磨）afamilyasshownintheaccompanying（附随的）pedigree.12345678910Deducethemostlikelymodeofinheritance.Whatwouldbetheoutcomesofthecousinmarriages1x9,1x4,2x3,and2x8?WhataretheMendel’slaws?Twoblackguineapigs(天竺鼠)werematedandoverseveralyearsproduced29blackand9whiteoffspring.Explanationtheseresults,givingthegenotypesofparentsandprogeny.Youhavethreedice:onered(R),onegreen(G),andoneblue(B).Whenallthreedicearerolledatthesametime,calculatedtheprobabilityofthefollowingoutcomes:6(R)6(G)6(B);6(R)5(G)6(B);6(R)5(G)4(B)nosixesatall;2sixesand1fiveonanydice;3sixesor3fives;thesamenumberonalldice;adifferentnumberonalldiceA.Theabilitytotastethechemicalphenylthiocarbamide(苯(基)硫脲(一种用于人类遗传学研究的味觉试验的结晶物质)isanautosomaldominantphenotype,andtheinabilitytotasteitisrecessive.Ifatasterwomanwithanontasterfathermarriesatastermanwho,inapreviousmarriage,hadanontasterdaughter,whatistheprobabilitythattheirfirstchildwillbeanontastergirlatastergirlatasterboyB.Whatistheprobabilitythattheirfirsttwochildrenwillbetastersofanysex?Supposethatahusbandandwifearebothheter
