Exploring Traits Further

Exploring Traits Further

People have always been intrigued by questions related to who they are and where they come from. How does a new individual come to be? How do we acquire the characteristics we possess? Are there ways to explain and predict human traits? This webquest is designed to begin to answer some of those questions by looking at the influential work performed in genetics. 

 

Part 1: "Children Resemble thier Parents"

Read through the paragraph then click on the ANIMATION tab and go through the animation.

1.      Why do we resemble our parents?

2.      When left alone, pea flowers _____________________________________________________.

3.      What is the male part of a flower?

4.      What is the female part of the flower?

5.      Describe self-fertilization.

6.      Describe cross-fertilization.

 

Part 2: "Genes come in Pairs"

Read through the paragraph then click on the ANIMATION tab and go through the animation.

1.      When Mendel looked at the traits of the pea plants, what conclusion did he make?

2.      What is another name for self-fertilizing?

3.      What does "pure-bred" mean?

4.      What is the visible trait called?

5.      What is an allele?

6.      What is the pair of alleles an organism possesses called?

 

Part 3: "Genes don't blend"

Read through the paragraph then click on the ANIMATION tab and go through the animation.

1.      Summarize what the title of the section, Genes don't blend, means.

2.      What is a hybrid offspring?

 

Part 4: "Some genes are dominant"

Read through the paragraph then click on the ANIMATION tab and go through the animation.

1.      Why do offspring that are a result of a cross of two different pure-bred organisms appear to have only one of the traits?

2.      What does homozygous mean?

3.      What does heterozygous mean?

4.      What happens if you cross a heterozygous organism with a heterozygous organism?

5.      Click on "Problem" tab. Work through the problem. There are five questions.

 

Part 5: "Genetic inheritance follows rules"

Read through the paragraph then click on the ANIMATION tab and go through the animation.

1.      What is Mendel's Law of Segregation?

2.      What is used to keep track of the gametes and possible offspring combinations?

3.      What is the ratio of genotypes produced in the example of crossing a heterozygous yellow pea with another heterozygous pea? 

4.      What is the ratio of phenotypes produced in the example of crossing a heterozygous yellow pea with another heterozygous pea?

 

Part 6: Learn about Mendel's experiments

Go through the animation to learn more about Mendel's experiments.

1.      Who was Gregor Mendel?

2.      What did Mendel study?

3.      Why did Mendel use pea plants? 

4.      In the first experiment, you planted 5 seeds. What were the colors of the flowers on the offspring plants?

5.      How many different traits do you see in the plants?

6.      List the traits that Mendel observed in his pea plants.

7.      Cross 5 pairs of plants, examining the offspring of each cross. Can you find any patterns of inheritance? Tell me about them.

8.      Cross a plant with round seeds with itself. What pea shapes do the offspring have?

9.      Cross a plant with wrinkled seeds with itself. What pea shapes do the offspring have?

10.    What did you learn about your peas in regards to pea shape?

11.    When you cross two plants with wrinkled peas, what do you predict the offspring to have? What information led you to this prediction?

12.    What information did Mendel gather about genetics and how traits are passed on to offspring?

13.    What did Mendel call the traits that appear to mask or hide the other traits?

14.    What did Mendel call those traits that seemed to be hidden?

15.    Explore the different traits by crossing different plants. Circle the characteristic that is dominant for each trait.

         Flower color             white            purple

         Pea shape                 round          wrinkled

         Pod shape                 inflated        constricted

         Pea color                  yellow          green

         Pod color                  yellow          green

         Plant size                  tall               dwarf

         Position of flowers   terminal        axial