Sample problems on probabilities

Sample problems on probabilities - Rule of multiplication...

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Rule of multiplication (Product Law) is that the probability that independent events will occur simultaneously is the product of their individual probabilities. Question1: In a Mendelian cross between pea plants that are heterozygous for flower color ( Pp ), what is the probability that the offspring will be homozygous recessive? Answer: Probability that an egg from the F 1 ( Pp ) will receive a p allele = 1/2. Probability that a sperm from the F 1 will receive a p allele = 1/2. The overall probability that two recessive alleles will unite, one from the egg and one from the sperm, simultaneously, at fertilization is: 1/2 X 1/2 = 1/4. Question 2: Probability of rolling a 2 and then a 4 with a dice P(2 and 4) = 1/6 x 1/6 = 1/36 Question 3: If both parents are Bb what is the probability of the offspring being bb? Answer: The offspring must receive a b gamete from both parents. The probability of a b sperm is 1/2 The probability of a b ovum is also 1/2 Thus the probability of a bb offspring is the product of the two
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Sample problems on probabilities - Rule of multiplication...

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