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Combining Probabilities

# Combining Probabilities - of the other parent written on...

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Combining Probabilities 9:3:3:1 can be obtained in a dihybrid cross by first calculating probabilities for two monohybrid crosses and then combining their probabilities. probability of round = 3/4 probability of wrinkled = 1/4 probability of yellow = 3/4 probability of green = 1/4 probability of round and yellow = 3/4 X 3/4 = 9/16 probability of round and green = 3/4 X 1/4 = 3/16 probability of wrinkled and yellow = 1/4 X 3/4 = 3/16 probability of wrinkled and green = 1/4 X 1/4 = 1/16 Other Crosses The following steps can be used to determine the expected number of offspring from any cross. 1. Determine the kinds of gametes that can be produced by each parent. 2. Determine all of the possible combinations of gametes that can be produced. A Punnett square may be useful for this. If you use a Punnett square, the gametes of one parent are written across the top and the gametes

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Unformatted text preview: of the other parent written on one side. The number of cells in the square is therefore equal to the number of gametes that one parent can produce multiplied by the number of gametes that the other parent can produce. Example: Let T = tall, t = short F = inflated, f = constricted List the phenotypes produced by the following cross: TtFf X ttFf Step 1: List the kind of gametes produced by each parent. TtFf can produced TF, Tf, tF and tf. ttFf can produce tF and tf. Step 2: Construct a Punnett square. The Punnett square above shows that eight different genotypes are produced. The phenotype for each is listed in the table below. Genotype Phenotype tTFF, tTFf, tTfF tall, inflated tTff tall constricted ttFF, ttFf, ttfF short inflated ttff short, constricted...
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