# AP Biology Grid-Ins Practice Test 3

### Test Information

6 questions

9 minutes

1. A female fruit fly hybrid for both gray body (Gg) and normal wings (Nn) is crossed with a male with black body (gg) and vestigial wings (nn): GgNn × ggnn

The F1 results of the cross are shown in the chart below.

 A B C D Gray normal Black vestigial Gray vestigial Black normal 969 941 190 184

Given the data above, calculate the rate of cross-over that produced the gray vestigial and black normal offspring. Give your answer to the nearest tenth.

2. A student crossed a purple dahlia with a yellow dahlia and found that all the offspring produced purple-flowers. She then crossed those purple-flowered offspring (F1) and produced 350 plants. Of their offspring (F2), 101 produced yellow flowers and 249 produced purple flowers. Calculate the chi-squared value for the null hypothesis that the purple-flowered F1 plants were all hybrid. Give your answer to the nearest tenth.

3. Here is a graph that shows a growth curve for a population of bacteria.

Calculate the mean rate of population growth between day 2 and day 4. Give your answer to the nearest whole number.

4. In a certain population of birds, the allele for a crown on the head (C) is dominant to the allele for no crown on the head (c). A particularly cold and long winter favored the birds with no crown. When spring came, researchers determined that the population was currently in Hardy-Weinberg equilibrium and that the occurrence of the birds with no crown was up to 24%. What will the frequency of the no-crown allele be in 10 years? Give your answer to the nearest hundredth.

5. Here is the volume of the world’s water supply (× 1,000 km3). Our drinking water comes from the freshwater located in groundwater, lakes, ice sheets, glaciers, and rivers.

 Source Volume Oceans, seas, and bays 1,338,000. Ice sheets and glaciers 24,064. Groundwater Fresh Saline 23,400. (10,530.) (12,870.) Soil moisture 16.5 Ground ice and Permafrost 300. Lakes Fresh Saline 176.4 (91.0) (85.4) Atmosphere 12.9 Swampwater 11.47 Rivers 2.12 Biological water 1.12 Total 1,385,984

What percentage of all the water on Earth is freshwater? Give your answer in percent to the tenths place.

6. Here is a sketch that shows Earth’s water cycle including the oceans and continents. Assuming that total precipitation equals total evaporation, what is the value of evaporation from the land to the atmosphere?