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Bio 101 Chromosomes chapter 11

# Bio 101 Chromosomes chapter 11 - Final exam Lecture Dec 12...

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Final exam Lecture Dec 12 ARC103 Dec 13 Arc 103 Dec 17
Probability All genetic ratios are expressed in terms of probability (expected frequency) -probability 0-1 In monohybrid crosses, the F2 expected ratio of dominant and recessive phenotype is 3:1 3 chances in 4 (3/4 or .75) of a dominant phenotype 1 chance in 4 (1/4 or .25) of a recessive phenotype

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-Predicts the combined probabilities of independent events -example 1. tossing a coin Example 2. if both parents are Bb, what is the probability they will produce a child who is bb? ¼ BB ¼ Bb ¼ bB ¼ bb
The sum rule predicts the combined probabilities of mutually exclusive events (if one occurs, the other cannot) Example: if both parents are Bb, What is the probability that their first child will Also have Bb genotype? There are two mutually exclusive possibilities: B egg, b sperm or B sperm, b egg Use the sum rule to combine the probabilities: ¼ + ¼ = ½

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B. Set 2 problem 1 If a woman and a man who are both heterozygous for freckles produce a c what is the probability that it will not have freckles a.0 b.1 c.¼ d.½ e.¾ f.None of above
Linkage Thomas Morgan. Model organism: fruit fly (Drosophila) Genes are arranged in a linear order on each

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Bio 101 Chromosomes chapter 11 - Final exam Lecture Dec 12...

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