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Genetics Lecture - Oct.9 2009 Genetics Lecture Example...

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Oct.9. 2009 Genetics Lecture Example Problem 1. Following results in the F2 generation offspring’s Round leaves, blue flowers 113 plants Round leaves, red flowers 26 Oval leaves, blue flowers 323 plants Oval leaves, red flowers 98 O=oval B=Blue o=round b=red Parent 1- Red Oval, Parent 2- Blue, round - BbOo x BbOo BO Bo bO Bo BO Bo bO Bo 560 Total Plants 9 B_O_ = Blue, Oval . 9/16 560= 315 3 B_oo = Blue, round. 3/16 560 = 105 3 bbO_= Red, Oval. 3/16 560 = 105 1 bboo = Red, Round 1/16 560 = 35 a. which two traits are dominant Oval and blue
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b. What are the genotypes of the original parents? Male: Female: c. What are the possible gametes for these parents? Male: Female: What 2. You have two parents who are each carriers for two separate recessive condition. What is the probability that their children will have at least on of the diseases? AaBb x AaBb Aa x Aa Bb x Bb ¾ A_ B_ ¾ aabb – (1/4)(1/4) = 1/16 A_bb – (3/4)(1/4) = 3/16 aaB_ - (3/4)(1/4) = 3/16 X-linked vs autosomal If trait is X-linked recessive - will get different results from reciprocal crosses: - -Female
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