fruit fly lab

fruit fly lab - vestigial wings normal eyes flies do not...

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David Tsai Normal Wings Apterous Wings 357 162 Normal Wings + Normal Eyes Normal Wings + Sepia Eyes Vestigial Wings + Normal Eyes Vestigial Wings + Sepia Eyes 208 41 150 17 Red Eye Males White Eye Males 50 47 Red Eye Females White Eye Females 58 46 Conclusion: Normal vs. Apterous- The ratio should have been 3:1. The gene for normal wings is dominant over the gene for apterous wings. Therefore a cross between two heterozygous flies (Nn x Nn) would yield a phenotypic ratio of 3 normal wings to 1 apterous wing. Our class data shows that we were close to this ratio. Normal Wings + Normal Eyes vs. Normal Wings + Sepia Eyes vs. Vestigial Wings + Normal Eyes vs. Vestigial Wings + Sepia Eyes- The ratio should have been 9:3:3:1. Since there are two traits involved, it involves a dihybrid cross. The cross is between two heterozygous flies (NnRr x NnRr), which would result in a phenotypic ratio of 9:3:3:1. Our results show that the numbers for
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Unformatted text preview: vestigial wings + normal eyes flies do not conform to the ratio. This could be due to errors in counting. Red Eye Males vs. White Eye Males- The genes for red eyes/white eyes are sex-linked. The ratio should have been 1:1 for both male and female. Our class data shows that we were close to this ratio. Red Eye Females vs. White Eye Females- The genes for red eyes/white eyes are sex-linked. The ratio should have been 1:1 for both male and female. Our class data shows that we were off from the ratio by a little. The errors in this lab can only be attributed to counting errors. Since some of the traits (male vs. female) are hard to differentiate, we are prone to errors. This lab could be improved through more careful counting and the increased use of microscopes to aide the counting process....
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