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McGraw Hill Integrated II, 2012 View details

5. Using the Distributive Property

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Exercise 61 Page 42

Start by making a table that shows the gene combinations and resulting eye colors.

Expression: 0.5Bb+0.5b^2
Probability: 1/2

Practice makes perfect

We know that Elisa has brown eyes with Bb genes, and Bob has blue eyes, meaning he has bb genes. Let's make a table that shows the gene combinations and resulting eye colors.

We see that among the four possible combinations, the probability of having a child with blue eyes is equal to the probability of having a child with brown eyes. 0.5Bb+ 0.5bb ⇔ 0.5Bb+0.5b^2 The probability that their child would have blue eyes is 0.5, or 12.