Introduction to Genetic Analysis 109

Introduction to Genetic Analysis 109 - 44200_03_p73-114...

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108 Chapter 3 The Chromosomal Basis of Inheritance the parental female must be the one sheltering the d al- lele, because, if the male had the d , he would have been dusky, whereas we were told that he had transparent wings. Therefore, the female parent would be D / d and the male D . Let’s see if this suggestion works: if it is true, all female progeny would inherit the D allele from their father, so all would be transparent winged. This was observed. Half the sons would be D (transparent) and half d (dusky), which was also observed. So, overall, we can represent the female parent as D / d ; L / l and the male parent as D ; L / l . Then the progeny would be 1. Two Drosophila Fies that had normal (transparent, long) wings were mated. In the progeny, two new phenotypes appeared: dusky wings (having a semi- opaque appearance) and clipped wings (with squared ends). The progeny were as follows: ±emales 179 transparent, long 58 transparent, clipped Males 92 transparent, long 89 dusky, long 28 transparent, clipped 31 dusky, clipped a. Provide a chromosomal explanation for these re-
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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.

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