NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIEN Part Il-Mendelian Genetics Afer

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NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIEN Part Il-Mendelian Genetics Afer obaining some PTC from Arthur Fox. LH. Syder dermined the PTC phenotype (an taste or cannot aste) for the members of 100 nuckear familics He fist vonified thar gender was not a factor by comparing the umber of male tasters and non-tastersto the number of female esters and non-tasters. Because chere was ow ntially no difference betwoen sess, Snyder grouped families by dhe phenotypes of dhe parents, disregarding the gendet ofach parent, and tabulated his data (Snyder. 1931a) of Childrern Con taste Connot taste Both parents can taste 40 16 37 17 90 One parent can aste 51 80 the odhet sanno Neithw parent cancae Questions . Wha kind of cridice wwld indiwe thar the sbitity to taste PTC is inhetid 2 Whyr wa it impotent for Suyder ws wendy that males and femals had simdar proportions of tatcen and o tasters? 3. Why do conples whe can tae PTC have chiädren who cannot 4. What is the significance of the fikt thar cowpks who canex taste PTC r have children wh can? 5. Based oo these dau, what can u condudk shour PTC raste Nindnes! What i your cvidence 6. The weoond parent-phenotype co mbinarion would appear to repIesnt a group of tescnse What raios are expected from testcrosss and what dees each ratio represent These data don't seem to fr cither of choc expected ratks. How ean yow xplain thi Reference Snyder E H 1931 Inherined ate deficknmy Sime 74: 151-152

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