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Unformatted text preview: 68 Chapter 2 • Patterns of Inheritance 33. The normal eye color of Drosophila is red, but strains in which all flies have brown eyes are avail- able. Similarly, wings are normally long, but there are strains with short wings. A female from a pure line with brown eyes and short wings is crossed with a male from a normal pure line. The F 1 consists of normal females and short-winged males. An F 2 is then produced by intercrossing the F 1 . Both sexes of F 2 flies show phenotypes as follows: Deduce the inheritance of these phenotypes, using clearly defined genetic symbols of your own inven- tion. State the genotypes of all three generations and the genotypic proportions of the F 1 and F 2 . U NPACKING P ROBLEM 33 Before attempting a solution to this problem, try answering the following questions: 1. What does the word “normal” mean in this problem? 2. The words “line” and “strain” are used in this problem. What do they mean and are they interchangeable?...
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.
- Spring '08