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January 18, 2013

January 18, 2013. (A Day) Agenda DSJ # 20 Probability and Genetics (Notes) Punnett Squares Practice (Worksheet ) DSR # 20. January 22 , 2013. (B Day) Agenda DSJ # 20 Probability and Genetics (Notes) Punnett Squares Practice (Worksheet ) DSR # 20. DSJ # 20.

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January 18, 2013

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  1. January 18, 2013 (A Day) Agenda • DSJ #20 • Probability and Genetics (Notes) • Punnett Squares Practice (Worksheet) • DSR #20

  2. January 22, 2013 (B Day) Agenda • DSJ #20 • Probability and Genetics (Notes) • Punnett Squares Practice (Worksheet) • DSR #20

  3. DSJ #20 Science Notebook – Page 42B Prompt: In 5 sentences or more, describe situations in which you have or might use a coin toss to decide an issue. Why would a coin toss be ideal in these situations?

  4. Probability and Genetics

  5. Learning Objective • Students will know what Punnett square is and how it’s used in genetics.

  6. Principles of Probability 1. A number that describes how likely it is that a certain event will occur is called probability. 2. Example: What is the probability that a tossed coin will land on heads? On tails?

  7. Principles of Probability 3. & 4. The laws of probability predict what is likely to occur, not necessarily what will occur.

  8. One way you can express a probability is as a percentage. A percentage (%) is a number compared to 100. For example, 50% means 50 out of 100. Suppose that 3 out of 5 tossed coins landed with heads up. Here’s how you can calculate what percent of the coins landed with heads up. Write the comparison as a fraction. 3 out of 5 = 3/5 2. Multiply the fraction by 100% to express it as a percentage. 3/5 x 100%/1 = 60% Principles of Probability:Percentages

  9. Practice Problem Suppose 3 out of 12 coins landed with tails up. How can you express this as a percent? 25% Principles of Probability:Percentages

  10. Probability and Genetics 5. Whenever Mendel crossed two hybrid plants for stem height (Tt), his results were the following: (Write the answer as a fraction and as a percent) Tt Tt

  11. Probability and Genetics 6. Mendel realized that the principles of probability could be used to predict the results of genetic crosses.

  12. Probability and Genetics 7. A chart that shows all possible combinations of alleles that can result from a genetic cross is called a Punnett square. Punnett Square

  13. Probability and Genetics:A Punnett Square The diagrams show how to make a Punnett square.

  14. Probability and Genetics 8. In a genetic cross, the allele that each parent will pass on to its offspring is based on probability.

  15. Probability and Genetics Tall T t T TT Tt Tall t Tt tt

  16. Glue in SNB **Please remember to use only TWO drops of glue!!** If everyone uses only TWO drops, a lot of glue is saved over time…. • 41A – Probability and Genetics (Notes) • 42A – PunnettSquares Practice

  17. DSR #20 • Science Notebook – Page 42B (Under DSJ #20) • Prompt: What is probability? What did Mendel find useful with the principles of probability? What is the chart that is used in genetics and what does it show geneticists?

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