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QUESTION 7 Ensure answers are clearly labelled a) and b). Consider the following pedigree. Solid symbols represent individuals affected by the trait. Assume complete penetrance and non-variable expressivity. I II III a) What is the mode of inheritance of this trait? (1) b) Does the ratio of affected to unaffected offspring in generation III-1 to III-4 match the expected ratio for this mode of inheritance? Explain your answer in terms of the expected ratio versus the ratio observed. Give a reason for your answer. (No mark is assigned for yes or no). (3)

          QUESTION 7
Ensure answers are clearly labelled a) and b).
Consider the following pedigree. Solid symbols represent individuals affected by the trait. Assume complete penetrance and non-variable expressivity.

I
II
III

a) What is the mode of inheritance of this trait? (1)
b) Does the ratio of affected to unaffected offspring in generation III-1 to III-4 match the expected ratio for this mode of inheritance? Explain your answer in terms of the expected ratio versus the ratio observed. Give a reason for your answer. (No mark is assigned for yes or no). (3)

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QUESTION 7
Ensure answers are clearly labelled a) and b).
Consider the following pedigree. Solid symbols represent individuals affected by the trait. Assume complete penetrance and non-variable expressivity.

I
II
III

a) What is the mode of inheritance of this trait? (1)
b) Does the ratio of affected to unaffected offspring in generation III-1 to III-4 match the expected ratio for this mode of inheritance? Explain your answer in terms of the expected ratio versus the ratio observed. Give a reason for your answer. (No mark is assigned for yes or no). (3)

Added by Jose Francisco F.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Caryl Abrenica

Step 1

First, let's analyze the pedigree. We see that the trait appears in every generation, which suggests that it is a dominant trait. Also, we see that both males and females are affected, which suggests that it is an autosomal trait. Therefore, the mode of Show more…

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Ensure answers are clearly labelled a) and b). Consider the following pedigree. Solid symbols represent individuals affected by the trait. Assume complete penetrance and non-variable expressivity. a) What is the mode of inheritance of this trait? (1) b) Does the ratio of affected to unaffected offspring in generation III-1 to III-4 match the expected ratio for this mode of inheritance? Explain your answer in terms of the expected ratio versus the ratio observed. Give a reason for your answer. (No mark is assigned for yes or no). (3)

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