All students: Answer all questions (that you did not answer in class on Friday or today) from the handout in class given out to most students on Friday.  If you need information, look at the SEPUP book, Activity 60.  To get to the SEPUP book, use the first link in the list to the right of this information. ------>

For those several students absent today, you can catch up on today's work by copying the new Vocabulary at the bottom of this page, and by reading Activity 60: Mendel, First Geneticist from the SEPUP book.  To get to the SEPUP book, use the first link in the list to the right of this information. ------>. Then, answer the questions on the Notes given out on Friday:  

Stopping to Think Questions for: Mendel, First Geneticist

1. Name ________________   Per. _____ Date __ Stopping to Think Questions for: Mendel, First Geneticist 1. What personal qualities do you think Mendel must have had that helped him in his work?

2. a. What were the advantages for Mendel in using pea plants for his breeding investigations?

     b. Why did Mendel perform so many crosses for the same characteristics?

3. Explain how the model in Activity 59, “Gene Combo,” works exactly like Mendel’s explanation for his results with pea plants.

Analysis Questions on p. D-31 to 34:
1.  Based on Mendel’s results, which trait for each pea characteristic is dominant? In your science notebook make a table like the one below. In your table, list the dominant and recessive traits for each characteristic.

2.a. Calculate to the hundredths place the ratio of dominant to recessive for each characteristic in the third generation. Record the ratio for each characteristic in the table you prepared for Question 1.

    b. Why are the ratios not exactly 3:1?

3.  Look at the pie chart on the previous page, which shows the ratio of green-seeded and yellow-seeded offspring. Explain why a 1:3 ratio of green-seeded plants to yellow-seeded plants is the same as a fraction of green-seeded plants.

4.  Mendel performed his experiments on more characteristics than the four shown in the circle graph, “Seed color ratios”, shown above on the previous page.   Why was it important for him to look at more than one characteristic?

5.  Reflection:  People often think of mathematics as important to physics and chemistry, but not to life science (biology). What is your opinion?

Vocab: (copy definitions into your vocab section):
Also: Allele , Dominant , Recessive.
Carrier - An organism that carries and transmits a disease but has no symptoms of the disease. Genetic diseases are caused by a recessive gene. If an organism is heterozygous (has 1 dominant and 1 recessive gene), then the condition is hidden. The organism can, however, transmit the recessive allele to their offspring. If the other parent also gives a recessive allele for the condition, then their offspring will have the disease.

Heterozygous - an organism that has more than 1 kind of allele for a characteristic. (ex: Bb)

Homozygous - an organism that has only one kind of allele for a characteristic. (ex: BB or bb)

Punnett Square - diagram to show the likelihood of each outcome of a breeding experiment with known parent genes for a trait.