Drosophila Lab: Exploring Genetics. AP recommended lab. Two Tasks to Complete. Pre-lab Questions from 12 Recomm. Labs (link from my website) Computer Simulated Lab: “Gene Pool” drive ***Answer Questions on a separate paper. To Access the Lab Simulation for Drosophila.
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AP recommended lab
(link from my website)
***Answer Questions on a separate paper.
Monohybrid: Red Eyes x Sepia Eyes
Dihybrid: Eye color, Wing
Sex-Linked: White eyed-female x Red eyed Male
(X? X ? ) • (X ? y )
-78 red-eyed females
-62 white-eyed females
-69 red-eyed males
-73 white eyed males
Expected Results: Complete #3 (both Tables)
Do a Chi-square analysis.
**Note: Critical values are listed in Table 7.5 on the bottom of Page 86.
Assume that the following Data was obtained and determine if it is significant or not by calculating a Chi-Square value.
X2 = (78-72)2 + (69-71)2 + (62-71)2 + (73-71)2
71 71 71 71
X2 = 0.69 + 0.06 + 1.14 + 0.06
X2 = 1.94
Degrees of freedom: (4 categories) 3
Critical Value: see Table7.3 (pg.85) 7.82
The chi-squared value is less than 7.82
Therefore:Our null hypothesis is accepted: That there is not a significant difference between the observed value and expected value. We must then accept that our results follows the expected (theoretical value).
Phenotype# Observed# Expected
Red-Eyed 140 calc. value
sepia 60 calc. Value
Total: 200 offspring
Complete Questions #6 & 7
**complete and calculate Chi-Square values to determine if the results are significant and acceptable (statistically valid)