lecture10+mendel+1-1

s allele 12 05 s allele 12 05 using probabilities

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Unformatted text preview: ey assort independently. From Punnett Squares to Probabilities •  If an event is certain to happen, probability = 1 •  If an event cannot possibly happen, probability = 0 •  All other events have a probability between 0 and 1 •  So, for SS homozygotes, the probability that a gamete will carry S = 1 •  And for ss homozygotes, the probability that a gamete will carry the s allele = 1 •  For an Ss heterozygote, the probability that a gamete will carry an... •  S allele = 1/2 (0.5) •  s allele = 1/2 (0.5) Using probabilities instead of Punnett Squares Gamete from parent 1 Gamete from parent 2 Some Simple Rules of Probability Theory The Multiplication Rule: •  Probability of two independent events happening together: multiply the probabilities of the individual events. •  Tossing two coins: probability that both will come up heads: •  ½ x ½ = ¼ •  In the F2’s, there is 1 way to get an SS offspring (½ x ½ = ¼) & 1 way to get an ss offspring (½ x ½ = ¼). Ø།  That is, you have two “draw” 2 S-alleles in a ro...
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This document was uploaded on 02/19/2014.

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