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Saturday Study Session 2 Theme of the day: Information Transfer Session 4 - Mendelian Genetics Question 1 Answer A Clue: Highest percentage of Roan = Rr Question 2 Answer D Clue: recessive = must be homozygous recessive Question 3 Answer B Clue: all traits are homozygous and opposites Question 4 Answer C Clue: two different genes affect one trait Epistasis BbCc BbCc Sperm 1 1 1 1 1 4 BC 1 4 bC 1 4 1 Bc 4 bc 4 BC BBCC BbCC BBCc BbCc 4 bC BbCC bbCC BbCc bbCc 4 Bc BBCc BbCc BBcc Bbcc 4 bc BbCc bbCc Bbcc bbcc 9 16 3 16 4 16 Dihybrid – Normal 9:3:3:1 ratio Question 5 Answer C Clue: AB; but both parents are B Codominance (AB) & Multiple Alleles Question 6 Answer B Clue: one gene with several phenotypic effects Pleiotropy (Sickle Cell) Math Grid In Answer • The correct answer is: 1/32 Father – A a B b C c D d Mother -A a B B c c D d Desired - A a B B Cc dd #arrows = 2/4 2/4 2/4 ¼ Reduce ½ x ½ x ½ x ¼ = 1/32 Short Free Response 1 (4 points possible) • Possible points awarded for: Discussion of this being an X-linked trait (1pt.) Discussion of the trait “skipping a generation” (1 pt.) Discussion of only males being affected and females being shown as carriers. (1 pt.) Discussion of a female inheriting two recessive alleles; one on each of her twoX chromosomes. (1pt.) Pedigree Short Free Response 2 (3 points possible) Possible points awarded for: Stating the order of genes being: vg-cn-rb-b (1 pt.) Discussion of the highest frequency being farthest apart. (1 pt.) Discussion of lowest frequency being closest together. (1 pt.) Crossover frequencies