Question

You can set up a Punnett square to do dihybrid problems just as you did with monohybrid problems. However, depending on the parental genotypes, the square may have as many as 16 boxes, rather than just 4. Insert the possible genotypes of the gametes from one parent in the top circles and the gamete genotypes of the other parent in the circles to the left of the box. (d) Possible genotypes of children produced by two parents heterozygous for both eye pigmentation and chin form: What is the ratio of the genotypes? What is the phenotypic ratio? (e) Recalling the discussion of probability in Section 13.1, state the probability of a child from part (d) having the following genotypes. ppDD PpDd PPDd To extend the probability discussion, let's reconsider flipping a coin by asking the question, What is the probability of flipping heads twice in a row? The chance of flipping heads the first time is 1/2. The same is true for the second flip. The chance (probability) that we'll flip heads twice in a row is 1/2 x 1/2 = 1/4. The probability that we could flip heads three times in a row is 1/2 x 1/2 x 1/2 = 1/8. (f) State the probability that three children born to the parents in part (d) will have the genotype ppdd. What is the probability that three children born to these parents will have dimpled chins and pigmented eyes? (g) What is the genotype of the F1 generation when the father is homozygous for both pigmented eyes and dimpled chin, but the mother has blue eyes and no dimple? What is the phenotype of this individual?

You can set up a Punnett square to do dihybrid problems just as you did with monohybrid problems. However, depending on the parental genotypes, the square may have as many as 16 boxes, rather than just 4. Insert the possible genotypes of the gametes from one parent in the top circles and the gamete genotypes of the other parent in the circles to the left of the box.
(d) Possible genotypes of children produced by two parents heterozygous for both eye pigmentation and chin form:
What is the ratio of the genotypes?
What is the phenotypic ratio?
(e) Recalling the discussion of probability in Section 13.1, state the probability of a child from part (d) having the following genotypes.
ppDD
PpDd
PPDd
To extend the probability discussion, let's reconsider flipping a coin by asking the question, What is the probability of flipping heads twice in a row? The chance of flipping heads the first time is 1/2. The same is true for the second flip. The chance (probability) that we'll flip heads twice in a row is 1/2 x 1/2 = 1/4. The probability that we could flip heads three times in a row is 1/2 x 1/2 x 1/2 = 1/8.
(f) State the probability that three children born to the parents in part (d) will have the genotype ppdd.
What is the probability that three children born to these parents will have dimpled chins and pigmented eyes?
(g) What is the genotype of the F1 generation when the father is homozygous for both pigmented eyes and dimpled chin, but the mother has blue eyes and no dimple?
What is the phenotype of this individual?

Added by Phillip F.

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