# AP Biology Grid-In Practice Questions

You will see six grid-in questions on the AP Biology test. They appear in the second part of the multiple choice section and require you to perform mathematical and scientific calculations to find the answer. While they appear in the multiple choice section, no answer choices are given to you. You must rely solely on your abilities to solve the question. You will have 90 minutes to answer all 63 multiple choice questions and 6 grid-in questions.

### Practice Question 1

Answer

**2.66**

The expected progeny would have phenotypes according to the following frequencies: three short straight-tailed, three short feather- tailed, one long straight-tailed, and one long feather-tailed. There are a total of 96 progeny as a result of this cross, so the null hypothesis would be that we would expect to see 36 short straight-tailed, 36 short feather-tailed, 12 long straight-tailed, and 12 long feather-tailed. We construct the chi-squared analysis as follows:

### Practice Question 2