46. 1102 Genetics II 10(2) - Genetics WEBQUIZ The first...

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Genetics WEBQUIZ The first webquiz is available online: http://courses.cit.cornell.edu/biog1102/quizzes.htm If you have any problems with logging on, please contact Dr. Sarvary a.s.a.p. (mas245). username: your net ID password: your CU ID number Please start your quiz early! The deadline of the quiz is Sunday at midnight, but emails sent about technical difficulties after Friday afternoon are not guaranteed to be answered before the deadline. Before you send an email… Please check out the FAQ page: http://courses.cit.cornell.edu/biog1102/FAQ.htm Most of your questions about BioG 1102 are already answered there. Genetics Complex crosses: If the genes sort independently, we can multiply individual probabilities PpYy (purple flowered, yellow seeds) X PpYy What proportion of offspring will be white flowered, with green seeds (ppyy)? Considering flower color, 1/4 will be white Considering seed color, 1/4 will be green So 1/4 X 1/4 = 1/16 will be white-flowered and green-seeded PPYY PY PPYy PY Py pY py PpYY PpYy PPYy PpYY PpYy PPyy PpYy Ppyy PpYy ppYY ppYy Ppyy ppYy ppyy Py pY py
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Harder one PPYy X PpYy What proportion of offspring will be purple flowered, with green seeds (P_yy)? All offspring will have the purple allele (PP or Pp) 1/4 of the offspring will be yy So 1/4 will be purple flowered with green seeds PPYY PY PPYy PY Py pY py PpYY PpYy PPYy PPyy PpYy Ppyy Py P_yy offspring from PpYy X PPYy 1 in 4 In mice, A y is a recessive allele of the agouti gene that is lethal before birth in homozygotes. However the allele is dominant for yellow coat color. If you repeatedly cross two heterozygous, yellow mice ( A y A ) and get 60 healthy offspring, how many will have yellow coats? A. 15
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46. 1102 Genetics II 10(2) - Genetics WEBQUIZ The first...

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