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# Homework 2 Answers - ¼ w w = 1/16 ¼ cn cn Red cn cn w Y...

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Homework 2 Dr. Larkin’s Problems A) sc sc (red eyes – no brown pigment) br br (brown eyes – no red pigment) sc sc br br (white eyes – no pigment) ½ sc+sc = ¼ wild type eyes ½ br+ br ½ sc sc = ¼ bright red eyes ½ sc+sc = ¼ brown eyes ½ br br ½ sc sc = ¼ white eyes 1) 4 Phenotypes 2) wild type eyes, bright red eyes, brown eyes, white eyes 3) ¼ wild type eyes, ¼ bright red eyes, ¼ brown eyes, ¼ white eyes B) Cn+ cn w+ w x cn+ cn wY Male Female Wild type: cn+ cn+ w+ Y 1/16 cn+ cn+ w+ w 1/16 ¼ w+ w = 1/16 cn+ cn w+ Y 1/8 cn+ cn w+ w 1/8 Sum: 1/16 + 1/8 = 3/16 1/16 + 1/8 = 3/16

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Unformatted text preview: ¼ w w = 1/16 ¼ cn+ cn+ Red: cn cn w+ Y 1/16 cn cn w+ w 1/16 ¼ w+ Y = 1/16 ¼ w Y = 1/16 White: cn+ cn+ w Y 1/16 cn+ cn+ w w 1/16 cn+ cn w Y 1/8 cn+ cn w w 1/8 ¼ w+ w = 1/8 cn cn w Y 1/16 cn cn w w 1/16 Sum: 1/16+1/8+1/16 = 4/16 1/16+1/8+1/16 = 4/16 ¼ w w = 1/8 ½ cn+ cn ¼ w+ Y = 1/8 Male: wild type: red: white 3: 1: 4 ¼ w Y = 1/8 ¼ w+ w = 1/16 Female: wild type: red: white 3:1:4 ¼ w w = 1/16 ¼ cn cn ¼ w+ Y = 1/16 ¼ w Y = 1/16 *Note: The fork line method can also be used with the phenotype to solve these problems (may be quicker)....
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Homework 2 Answers - ¼ w w = 1/16 ¼ cn cn Red cn cn w Y...

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