Probchisquare - Probability Chi Square Probability The proportion of times which an event occurs in a very large number of trials Probabilities

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Probability & Chi Square
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Probability: The proportion of times which an event    occurs in a very large number of trials. Probabilities range from: 0 (0%)  = where an event is certain  NOT to occur 1 (100%)  = where an event is             certain to occur
Background image of page 2
Example: Flipping a coin, what is the  probability of getting heads or tails? 1/2 or 50%  = heads 1/2 or 50%  = tails Example: Rolling a dice, what is the  probability of getting a particular number?        1/6 or 16%
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Product Rule: The probability of 2 or more events  occurring simultaneously  (together) is  the product  of their individual  probabilities.
Background image of page 4
Example: A monohybrid cross between:  Rr x Rr What is the probability of getting a homozygous recessive  offspring ( rr )? Individual Probabilities of: R  =  1/2 (0.5) r   =  1/2 (0.5) Probability of  rr ? 1[(1/2)(1/2)] =  1/4  or  0.25  or  25% Probability of  RR ? 1[(1/2)(1/2)] =  1/4  or  0.25  or  25% Probability of  Rr ? To get Rr: There are 2 possible combinations:  Rr  and  rR          2[(1/2)(1/2)] = 2(1/4) =  1/2  or  0.5  or  50%
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example: If we have 3 coins, what is the probability of getting  1 Head and 2 Tails? Individual Probabilities: H  =  1/2 (0.5) T  =  1/2 (0.5) Since there are  3  possible combinations: HTT TTH THT Our equation is as follows: 3[(1/2)(1/2)(1/2)] =  3(1/8)         =  3/8  or  0.375  or  37.5% 3 possible combinations
Background image of page 6
Sum Rule: The probability of one  or the other   mutually  exclusive events occurring is  the sum  of how often each other occurs  separately ( The sum of their  individual probabilities ).
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example: For a genotype  Cc , what is the probability  that a gamete will have either the  C  or  allele? Individual Probabilities:
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/03/2008 for the course BIO 2322 taught by Professor Spotswood during the Spring '08 term at The University of Texas at San Antonio- San Antonio.

Page1 / 24

Probchisquare - Probability Chi Square Probability The proportion of times which an event occurs in a very large number of trials Probabilities

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online