Name____________________________________ Date________________ Hour________________

Directions: Obtain a CD entitled "Biology Explorer 3.04 Genetics" and a coin from your instructor. Go quietly to the Media Center computer lab. Insert the CD and then complete the following activity. Return the CD to your instructor when finished.

PURPOSE: To discover how meiosis and heredity are related.

1. Go to the START MENU.
2. Place your cursor on PROGRAMS.
3. Move your cursor to "LOGAL Biology Teacher."
4. Click on GENETICS MAIN MENU.
5. Click on "CORE INQUIRIES."
6. Click on "MEIOSIS."
7. <<At this point, the arrows to move around through the program are at the very bottom of the screen. We may have to grab and drag the Start menu tool bar downward until we can’t see it any longer in order to uncover the arrows we need.>>
8. Follow the directions on each page to complete the exercise. Blue "hyperlinked" words in the directions text can be clicked on to perform certain functions.

QUESTIONS AND DATA TABLES:

1. What are the possible eye colors of the offspring?___________________ ___________________ ___________________
2. Does crossing over occur in each meiosis? ___________________
3. How many crossing over events do you see during meiosis? ___________________
4. Does crossing over occur beween sister chromatids or between non-sister chromatids? ___________________
5. Does crossing over always involve the same pair of chromatids? ___________________
6. Does crossing over occur in a specific location along the chromosome? ___________________
7. How many types of gametes does the male produce with respect to the eye color gene? ___________________
8. How many types of gametes does the female produce with respect to the eye color gene? ___________________
9. In what ratio? ___________________
10. [MALE] Draw the initial parental chromatids prior to crossing over. Label any chromatids involved in crossing over.

 

 

 

 

 

 

11. Draw the recombinant chromatids (after the chromatids have crossed over.)

 

 

 

 

 

 

12. Where there new genotypes in the resulting sex cells?____________________

[FEMALE] Draw the initial parental chromatids prior to crossing over. Label any chromatids involved in crossing over.

 

 

 

Now draw the recombinant chromatids.

 

 

 

 

 

13. Where there new genetic combinations in the resulting sex cells?________________________
14. [BOTH] How does the location of crossing over, relative to the location of the eye color gene, affect the types of gametes produced by the male?

 

15. What about by the female?

 

[MALE] Draw the initial parental chromatids prior to crossing over. Label any chromatids involved in crossing over.

 

 

 

 

 

Draw the recombinant chromatids.

 

 

 

 

 

16. Where there new genetic combinations in the resulting sex cells?__________________________
17. How does the location of crossing over, relative to the location of the two genes, affect the types of gametes produced by the male?

 

[FEMALE] Draw the initial parental chromatids prior to crossing over. Label any chromatids involved in crossing over.

 

 

 

 

 

Draw the recombinant chromatids.

 

 

 

 

 

18. Where there new genetic combinations in the resulting sex cells?________________________
19. How does the location of crossing over, relative to the location of the two genes, affect the types of gametes produced by the female?

 

20. Do new combinations of alleles of the two genes arise as a result of every crossing-over event?

 

21. If not, define the conditions under which crossing over gives rise to new combinations.

 

22. How does random choice and union of gametes affect genetic variation?