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Class 4

# Class 4 - Essential Statistics Punnett was a nice guy but...

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Essential Statistics

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Punnett was a nice guy but.. Fine for finding the genetic possibilities for a monohybrid cross YY x yy or Yy X Yy for example But for “dihybrids” or more there are many gametes on the axes! AABbCCdDee X AaBBCcDDEe ???? A better solution may be to use general rules of probability
What is probability? Simply an expression of the likelihood of an event It is formally the number of times an event occurs divided by the number of possible events For example given a plant with a genotype Yy, the probability of a gamete getting Y is 1/2.

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Addition rule If two events are mutually exclusive, the probability of their occurrence is the sum of the P’s: P 1 + P 2 + P 3 Typified by the words “either”, “or” What is the probability of either Obama or McCain becoming president (ans: 1) no chance of both being president or neither being president (Ralph??)
Example

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Example What is the probability of rolling a 2 or a three on a single roll of the die?
Example What is the probability of rolling a 2 or a three on a single roll of the die? A) 1/6 B) 1/3 C) 1/36 D) 1

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Example What is the probability of rolling a 2 or a three on a single roll of the die? A) 1/6 B) 1/3 C) 1/36 D) 1
Example What is the probability of rolling a 2 or a three on a single roll of the die? A) 1/6 B) 1/3 C) 1/36 D) 1 Ans: 1/6 + 1/6 = 1/3 – key element is the notion of mutually exclusive events (i.e. cannot roll a 2 and a 3 simultaneously!)

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Multiplication rule
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