Lecture 2 Bio325 Fall 07

# Lecture 2 Bio325 Fall 07 - 1 What is the probability of...

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1 1. What is the probability of rolling a 6 with one die? 2. What is the probability of rolling a 6 on two dice? 3. If you roll three dice, what is the probability of not rolling a 5 on any of them? 4. If you roll three dice, what is the probability of rolling the same number on all of them? Product rule: probability of event #1 AND event #2 = probability of event #1 * probability of event #2 Sum rule: probability of event #1 OR event #2 = probability of event #1 + probability of event #2 5. If you roll a die, what is the probability of rolling a 1 or a 2? 6. If you roll two dice, what is the probability that they will add up to 10?

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2 AaBb x AaBb ? probability of AABB offspring? probability of offspring homozygous at both loci? Trihybrid example: A , B , and C are dominant, a , b , and c are recessive aa BB cc x AA bb CC gametes: a B c A b C aA bB cC F1: gametes: a b c + a b C + a B c + a B C + A b c + A b C + A B c + A B C A = abberant gait, B = brown coat, C = curly tail
3 a b c A b c A B c a b C a B c a B C A b C A B C a b c A b c A B c a b C a B c a B C A b C A B C ? what percentage of the offspring have all three dominant traits ?

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