Make your own free website on Tripod.com

Name:______________________________________            Date:____________________

 DNA From The Beginning, Some Genes Are Dominant

Instructions:

1) Go to the website: http://www.dnaftb.org/dnaftb/4/concept/index.html “DNA From the Beginning, Some genes are dominant.”

This lesson will reinforce what we have been learning in class about dominant and recessive genes, and will help you better understand the reasoning behind the Punnett square.   

2) Read the  “Concept” page first to get an overview of how Mendel found out about dominant and recessive genes.  At the bottom of your screen, you will see a toolbar with links to the pages called “Concept,” “Animation,” “Gallery,” “Audio/Video,” “Bio,” “Problem,” and “Links.”  

3) Next, go to the “Animation” page.  Both you and your partner should take turns using the right arrow at the bottom of the screen to view the animation of Mendel’s dihybrid cross.  You can press the arrow pointing left when you are done so your partner can take a turn viewing the animation. 

4) Quickly view the “Gallery” page to see ways that Gregor Mendel was honored for his discoveries about genetics. 

5) Go to the “Audio/Video” page.  You may click on the audio definitions of

Allele, Dominant, Genotype, Heterozygous, Homozygous, Phenotype, Recessive at the top of the screen to hear these defined.  RealPlayer will open automatically.  If it does not open, go to the computer’s START menu and launch RealPlayer. 

6) To view the video interviews of Professor Robert Olby, click on the links labeled “Clip 1,” “Clip 2,” and “Clip 3” in that order.  Both partners need to view the three video interviews. 

7) Read the “Bio” page.  You should click on the “Charles Darwin” hyperlink to learn more about Charles Darwin and his theories. 

8) Now go to the “Problem” page.  Choose the best answer on the right of the screen, and write down the answer to the question.


Name:______________________________________            Date:____________________

DNA From The Beginning, Some Genes Are Dominant

Questions:

1- Name one way in which Gregor Mendel was honored for his work in genetics.

________________________________________________________________________

2- What is a dihybrid cross?  (mention the phenotypes as well as the genotypes)__________

________________________________________________________________________

________________________________________________________________________

3- Why did Mendel’s work with hawkweed cause him to doubt his own discoveries about genetics? 

________________________________________________________________________

________________________________________________________________________

4- Why did Darwin’s theory of evolution cause a renewed interest in Mendelian genetics in the early 1900s?

________________________________________________________________________

________________________________________________________________________

5- Why were Mendel’s original published studies largely unknown and unrecognized at first?

________________________________________________________________________

________________________________________________________________________

6- Why did Professor Olby compare Mendel to Doppler?

________________________________________________________________________

________________________________________________________________________

7-“What do you do to see which color is dominant?”

________________________________________________________________________

________________________________________________________________________

8- “What kind of flowers do you expect if colored flower is dominant?”

 

________________________________________________________________________

________________________________________________________________________

9-  “What is the genotype of these F1 plants?”

________________________________________________________________________

________________________________________________________________________

10- Describe Mendel’s theory of genetic inheritance.  How are dominant and recessive genes passed down from parents to offspring?  What is the difference between a genotype and a phenotype?

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

 

Lesson Plan

Back to Index Page