1 / 12

Drosophila Lab: Exploring Genetics

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.

ostinmannual
Télécharger la présentation

Drosophila Lab: Exploring Genetics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Drosophila Lab: Exploring Genetics AP recommended lab

  2. 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.

  3. 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.

  4. 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 )

  5. 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.

  6. Crosses to Complete for Lab #6 • Table 7.1: F1 Generation Data

  7. 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.

  8. 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).

  9. 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)

  10. Observed Values for #7 (table) Phenotype# Observed# Expected Red-Eyed 140 calc. value sepia 60 calc. Value Total: 200 offspring Complete Questions #6 & 7

  11. Data for Second Cross

  12. 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)

More Related