Biology Lesson – Punnett Squares

November 27, 2007

Go to http://highered.mcgraw-hill.com/sites/0078617340/student_view0/chapter5/math_practice.html

Do all 10 problems.  You MUST do a Punnett Square for each problem, or no credit.  For the problems where there is already a Punnett Square done for you, you must circle the box or boxes in the square that lead you to the answer.

Go to http://www.athro.com/evo/gen/punexam.html

Do only the first 4 problems (the monohybrid problems).  Number these problems #11-14.  Do not change the first pull down menu in the problem (for example, if it says “the bb genotype,” do not change that).  Just write the answer.

Go to http://biology.clc.uc.edu/courses/bio105/geneprob.htm

There are 10 problems (some with multiple parts), but you will only do 4 of them (number these #15-18):

Monohybrid Cross – Copy the Punnett Square and the ratios of the offspring (for example, ½ of offspring can hear, ½ of offspring are deaf).

Testcross – Copy the 3 Punnett Squares and the ratios of the offspring.

Incomplete Dominance – Copy the Punnett Square and the ratios of the offspring.

Scroll down and do

Sex (It’s a Phenotype, Not a Chromosome!) – Copy the Punnett square and the ratios of the offspring.

The following problems are only for students during the regular year, NOT for summer school students:   Do #1-13 from http://www.biology.arizona.edu/mendelian_genetics/problem_sets/monohybrid_cross/monohybrid_cross.html - copy the question (or at least the key phrases from the question) and write out the one correct answer

Biology Lesson 11/20/07

November 20, 2007

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Biology Lesson 10/31/08

November 13, 2007

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Look at the top right paragraph.

1.  Mitosis is the systematic process that ___________________________________________________

________________________________________________________________________________.

Read the Background Essay.

2.  What are the two categories of cells?

3.  What is the main difference between the two types of cells?

4.  The process of replication is relatively ____________ in prokaryotes as compared to eukaryotes.

5.  How much more DNA does a eukaryotic cell have as compared to a prokaryotic cell? 

6.  Eukaryotic cells undergo a complex, multistep process called mitosis in order to ensure that each _________________________________________________________________________.

7.  Because DNA replication and cell division in prokaryotes is simple, they can double their population size in just _______ minutes.

Click View to watch the Quicktime Video of Mitosis.  Turn Captions ON.

8.  Loose strands of DNA gather into ________________________.

9.  The chromosomes line up as pairs of sister _____________________ in the middle of the cell during

__ __ __ __ phase.

10.  The fibers then pull the ______________________ to the opposite poles of the cell during

__ __ __ phase.

11.  The cell membrane squeezes and pinches the cell in half, forming two separate cells with _______________ genetic information. 

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Click View to watch the Video “How Cancer Cells Grow and Divide”.

12.  Describe, in no less than three sentences, how a cell becomes cancerous and spread.  You MUST use the following words in your answer:  oncogene, receptor, growth signals, blood vessel.

Read the Background Essay.

13.  What is cancer?

14.  What are oncogenes?

15.  How do tumor cells encourage the growth of new blood vessels into and around the cancerous tissue?

16.  Why might endostatin help to treat cancer?

17.  In your opinion, what does cancer have to do with mitosis and cell division?

Biology Lesson 11/05/07

November 5, 2007

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