Biology Guided Worksheet Biology

Biology Genetics Guided Worksheet 2-10-12

**Go to http://www.phschool.com/science/biology_place/biocoach/ then click on the Mendelian Inheritance tab. Complete the following worksheet in 2 steps: Step One is to go through concepts 1-9 and answer all the questions in the worksheet below. Step Two is to then go through all the problems in the Genetic X files. Here are the questions for the first 7 concepts to be completed by the end of the hour today.

Step One

1. What is Mendel’s first law called? Now state the law. 2. What is Mendel’s second law called? Now state the law. 3. Under what assumption does Mendel make these laws? 4. What 3 exceptions to Mendel’s laws do we now know that Mendel did not? 5. Explain what a MendAlien is. **Select the Genetic X Files tab **Select Orange Eyes

6. What is the result of the P1 cross? 7. What are the genotypes of the parents in this P1 generation? 8. What are the phenotypes of the F2 generation and their percentages? 9. What is the F2 phenotypic ratio? 10. What is the simplest hypothesis for these results? 11. Explain what genotypes cause the 3:1 ratio in the F2 generation. 12. How can a black and an orange eyed alien produce a 2:2 ratio of black and orange offspring? 13. How is this different from a typical F1 cross? 14. Explain what a testcross is. **Select short legs

15. What is the result of the P1 cross between short legged females and long legged males? 16. Show the Punnett square for the results of the P1 cross. 17. What are the phenotypes of the F2 generation and their percentages? 18. What is the F2 genotypic ratio? 19. What is the simplest hypothesis for these results? 20. Explain what an X linked recessive trait is. 21. Explain why the F1 male has the mutant female phenotype. 22. Explain the term hemizygous. 23. Show the Punnett square that reflects the results of the F1 cross. 24. Show the Punnett square for a reciprocal cross where the P1 organisms are long legged female and long legged male. 25. What are the genotypes for the parents in the P1 generation? 26. What are the phenotypes of the F1 generation? 27. Show the Punnett square for the F2 generation. 28. What are the phenotypes of the F2 generation by gender? 29. Is there a 3:1 ratio overall? explain 30. Is there a 3:1 ratio with both males and females? Explain **Click on orange eyes and white skin 31. What are the phenotypes of the parents of the P1 generation in this cross? 32. What are the phenotypes of the F1 generation offspring? 33. What are the phenotypes and ratios of the F2 generation offspring? 34. What are the percentages of each phenotype in these offspring? 35. What is the simplest hypothesis that explains these results? 36. What does the 9:3:3:1 ratio signify? 37. What are the genotypes for the parents in this dihybrid cross? 38. Explain why the F1 MendAliens have the normal eyes and normal green skinned phenotypes.