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Welcome to Science 2/15

Weird True & Freaky: Animal Planet Today’s Schedule 1. Video of the Day 2. Probability & Genetics 3. Assignment. Welcome to Science 2/15. Probability & Genetics. You are going to flip your coin 20 times. Predict how many times the coin will be “heads up” and “tails up”

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Welcome to Science 2/15

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  1. Weird True & Freaky: Animal Planet Today’s Schedule 1. Video of the Day 2. Probability & Genetics 3. Assignment Welcome to Science 2/15

  2. Probability & Genetics • You are going to flip your coin 20 times. • Predict how many times the coin will be “heads up” and “tails up” • Record the results of each flip. • Probability- the likelihood that a particular event will occur.

  3. Principles of Probability • What is the probability that a coin tossed 1 time will land “heads up”? • The probability would be: 1 in 2 or 50% • What is the probability that a coin tossed 20 times will land “heads up”? • We would expect it to be 10 in 20 or 50% • But, this is not always the case. We might have 12 in 20, 15 in 20, or maybe 7 in 20.

  4. Genetics & Probability • Mendel recognized that the principles of probability could be used to predict the results of genetic crosses. • What is the probability that the hybrid pea plants would be tall? • 3 in 4 or 75%

  5. Genetics & Probability • How do we predict genetics? • Punnet Square- a chart that shows all the possible combinations of alleles that can result from a genetic cross. • Punnet Squares help scientists predict the outcome of a genetic cross.

  6. Phenotypes & Genotypes • Phenotype- an organisms physical appearance, or its visible traits • Genotype- an organisms genetic makeup or allele combinations

  7. Phenotypes & Genotypes • Homozygous- an organism that has two identical alleles for a trait. (homo = same) • Heterozygous- an organism that has two different alleles for a trait (hetero = different)

  8. Codominance • What happens when two organisms reproduce and there is not a dominant or recessive allele? • Both alleles will be expressed in the offspring. • Codominance- neither allele is dominant or recessive

  9. A closer look. • Punnett Squares • Drag-and-Drop Genetics: Monohybrid • Punnetsquares • punnet square interactive

  10. Make the Right Call Skills Lab • Making predictions is an important part of science. An accurate prediction can be a sign that you understand the event you are studying. In this lab you will make predictions as you model the events involved in genetic crosses. • Problem: How can you predict the possible results of genetic crosses? • Materials: 2 Paper Bags, 2 red beans and 2 white beans

  11. Analyze & Conclude Punnet Squares

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