Mendelian Genetics WebQuest



Mendelian Genetics WebQuest

( click on “Mendel’s Peas,” ( click on “Enter Web Lab.” Once in the lab, follow the directions for moving through Mendel’s experiments.

**NOTE – if you use the “back” button on the browser, it will take you back to the original start page, where you have to click on “enter web lab.” Make sure you have answered all relevant questions before moving on as you’ll have to redo much of your work to get back to where you were when you pressed the “back” button.**

1. When and where did Mendel live? ____________________________________________

2. What did Mendel study? ____________________________________________________

______________________________________________________________________________

3. Why did Mendel study pea plants?

a.

b.

4. How many traits are visible in pea plants? ________________

5. List them in the space below (make sure to include both options for each trait):

6. What were the traits of the pea plants for 2 of the 5 crosses you completed?

| |Cross 1 |Cross 2 |

|Traits |Parent 1 |Parent 2 |Parent 1 |Parent 2 |

|Pea Shape | | | | |

|Pea Color | | | | |

|Pod Shape | | | | |

|Pod Color | | | | |

|Flower Color | | | | |

|Plant Size | | | | |

|Flower Position | | | | |

7. For the 2 crosses you identified above, indicate the flower color, plant size and pea

color for each of the 5 offspring produced from each cross in the table below.

| |Cross 1 |

|Traits |Offspring 1 |Offspring 2 |Offspring 3 |Offspring 4 |Offspring 5 |

|Flower Color | | | | | |

|Plant Size | | | | | |

|Pea Color | | | | | |

| |Cross 2 |

|Traits |Offspring 1 |Offspring 2 |Offspring 3 |Offspring 4 |Offspring 5 |

|Flower Color | | | | | |

|Plant Size | | | | | |

|Pea Color | | | | | |

8. Are there some traits that get hidden from one generation to the next? ____________

9. When you cross one plant with itself, are its offspring always identical to itself? _____

10. Do purple flowers always produce all purple flowers? __________________________

11. Do white flowers always produce all white flowers? ____________________________

12. After following “Mendel’s” directions for the self-fertilization of the two plants, what

did you learn about the peas?

______________________________________________________________________________

______________________________________________________________________________

13. What are dominant traits? __________________________________________________

______________________________________________________________________________

14. What are recessive traits? ___________________________________________________

______________________________________________________________________________

15. Which flower color is dominant (circle one)? PURPLE or WHITE

16. Which characteristics are dominant and which are recessive? Fill in the table below by writing in the correct characteristic under each heading.

|Traits |Dominant |Recessive |

|Pea Shape | | |

|Pea Color | | |

|Pod Shape | | |

|Pod Color | | |

|Flower Color | | |

|Plant Size | | |

|Flower Position | | |

Once you have correctly identified all the characteristics that are dominant, chose the “exit” button. Then, go back to the original web lab directory (first link) and click on the “Punnett Squares” Link

17. What are Punnett Squares used for? __________________________________________

18. What do the letters in the boxes tell us about the offspring of the chickens? ________

______________________________________________________________________________

19. How often do we expect that brown chickens will be produced as a result of the

cross presented in the lab? _________________________________________________

20. Write in the correctly completed Punnett Square for the lemmings.

| |A |a |

|A | | |

|a | | |

21. How many lemmings will be heterozygous or carriers for the albinism trait, out of

four offspring? ___________________

22. What combination of lemmings from the first cross will give you the best possibility

for producing albino lemmings? __________x____________ (write their genes here).

23. How many tries did it take you to produce the long-tailed, albino lemming? ______

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