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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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two tasks to complete
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
To Access the Lab Simulation for Drosophila
  • Click the “START” and choose “My Computer”
  • Type in the following:

\\trhs_math_lang\genepool$

  • Choose the “Drosophila folder” and double click the “Neo” application.
  • Follow the instructions and answer the guiding questions listed on the front page of your lab.
key parts for drosophila lab
Key Parts for Drosophila Lab
  • Stages of Drosophila
  • Main Characteristics to observe (4)
  • Determining Male vs. Female (3)
  • Examine 3 Modes of Inheritance:

Monohybrid: Red Eyes x Sepia Eyes

Dihybrid: Eye color, Wing

Sex-Linked: White eyed-female x Red eyed Male

(X? X ? ) • (X ? y )

observed values
Observed Values
  • Table 7.2: F2 Generation

-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.

crosses to complete for lab 6
Crosses to Complete for Lab #6
  • Table 7.1: F1 Generation Data
f 2 generation sex linked trait
F2 Generation: Sex-Linked trait

Assume that the following Data was obtained and determine if it is significant or not by calculating a Chi-Square value.

answer for first cross
Answer for First Cross

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).

2 nd genetic cross
2nd Genetic Cross
  • Red-Eyed: Dominant S
  • Sepia eyes: Recessive s
  • Parental cross: SS X ss
  • F1 Cross: Ss X Ss
  • F1: All Ss
  • F2: 3:1 (red:sepia)
observed values for 7 table
Observed Values for #7 (table)

Phenotype# Observed# Expected

Red-Eyed 140 calc. value

sepia 60 calc. Value

Total: 200 offspring

Complete Questions #6 & 7

other crosses to do
Other Crosses to do
  • Pg 86: Green & Albino seedlings
  • Pg.88: Long & short winged flies

**complete and calculate Chi-Square values to determine if the results are significant and acceptable (statistically valid)