Standardized Test Prep

Multiple Choice

1. What happens to the chromosome number during meiosis?

   1. It doubles.

   2. It stays the same.

   3. It halves.

   4. It becomes diploid.

2. Which ratio did Mendel find in his F₂ generation?

   1. 3 : 1

   2. 1 : 3 : 1

   3. 1 : 2

   4. 3 : 4

3. During which phase of meiosis is the chromosome number reduced?

   1. anaphase I

   2. metaphase I

   3. telophase I

   4. telophase II

4. Two pink-flowering plants are crossed. The offspring flower as follows: 25% red, 25% white, and 50% pink. What pattern of inheritance does flower color in these flowers follow?

   1. dominance

   2. multiple alleles

   3. incomplete dominance

   4. polygenic traits

5. Which of the following is used to construct a gene map?

   1. chromosome number

   2. mutation rate

   3. rate of meiosis

   4. recombination rate

6. Alleles for the same trait are separated from each other during the process of

   1. cytokinesis.

   2. meiosis I.

   3. meiosis II.

   4. metaphase II.

7. Which of the following is NOT one of Gregor Mendel's principles?

   1. The alleles for different genes usually segregate independently.

   2. Some forms of a gene may be dominant.

   3. The inheritance of characteristics is determined by factors (genes).

   4. Crossing-over occurs during meiosis.

Questions 8–9

Genes A, B, C, and D are located on the same chromosome. After calculating recombination frequencies, a student determines that these genes are separated by the following map units: C–D, 25 map units; A–B, 12 map units; B–D, 20 map units; A–C, 17 map units.

8. How many map units apart are genes A and D?

   1. 5

   2. 8

   3. 10

   4. 12.5

9. Which gene map best reflects the student's data?

   1. 

   2. 

   3. 

   4. 

Open-Ended Response

10. Explain why meiosis allows organisms to maintain their chromosome numbers from one generation to the next.

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