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Biology (Grades 9–10) Midterm — Semester 2, Form A

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Science Grades 9–10 15 multiple choice + 1 written

Free printable Biology midterm (Grades 9–10): 15 multiple-choice questions plus 1 written response covering Cell Division & DNA, Genetics, Evolution & Ecology. Answer key included — customize it in the Midterm Maker.

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Biology (Grades 9–10) Midterm — Semester 2, Form A
Name: Date: Period:

Directions: Read each question carefully and choose the best answer. Answer the written response in complete sentences.

Covers: Cell Division & DNA · Genetics · Evolution & Ecology

Part 1: Multiple Choice

  1. In a sample of double-stranded DNA, 30% of the bases are adenine. What percent are guanine?
    1. A. 40%
    2. B. 20%
    3. C. 30%
    4. D. 70%
  2. Meiosis produces what?
    1. A. Four genetically different haploid cells
    2. B. Two identical diploid cells
    3. C. Four identical diploid cells
    4. D. Two different haploid cells
  3. One DNA strand reads ATCGGA. What is the complementary DNA strand?
    1. A. GCTAAG
    2. B. UAGCCU
    3. C. ATCGGA
    4. D. TAGCCT
  4. In RNA, which base replaces thymine?
    1. A. Uracil
    2. B. Guanine
    3. C. Cytosine
    4. D. Adenine
  5. Crossing over, which increases genetic variation, occurs during which stage?
    1. A. S phase of interphase
    2. B. Anaphase of mitosis
    3. C. Telophase II of meiosis
    4. D. Prophase I of meiosis
  6. In a cross of AaBb × AaBb, what fraction of offspring are expected to be aabb?
    1. A. 1/8
    2. B. 3/16
    3. C. 1/4
    4. D. 1/16
  7. A carrier mother (XᴴXʰ) and an unaffected father (XᴴY) have a son. What is the probability the son has hemophilia?
    1. A. 0%
    2. B. 25%
    3. C. 50%
    4. D. 100%
  8. Red and white snapdragons are crossed and all offspring are pink. What inheritance pattern is this?
    1. A. Complete dominance
    2. B. Codominance
    3. C. Incomplete dominance
    4. D. Sex-linked inheritance
  9. What phenotypic ratio is expected from a dihybrid cross of AaBb × AaBb with independent assortment?
    1. A. 3:1
    2. B. 1:1:1:1
    3. C. 1:2:1
    4. D. 9:3:3:1
  10. A person with type AB blood has A antigens and B antigens on their red blood cells. What inheritance pattern is this?
    1. A. Sex-linked inheritance
    2. B. Polygenic inheritance
    3. C. Incomplete dominance
    4. D. Codominance
  11. Primary succession begins in which type of area?
    1. A. An area with no soil, such as new lava rock
    2. B. An abandoned farm field
    3. C. A mowed lawn
    4. D. A forest after a wildfire
  12. Producers in an ecosystem contain 10,000 kcal. Using the 10% rule, about how much energy reaches secondary consumers?
    1. A. 5,000 kcal
    2. B. 10 kcal
    3. C. 100 kcal
    4. D. 1,000 kcal
  13. Which condition is required for natural selection to occur?
    1. A. A population of identical individuals
    2. B. Unlimited food and space
    3. C. Individuals changing traits on purpose
    4. D. Inherited variation among individuals
  14. Which organisms convert nitrogen gas from the air into forms plants can use?
    1. A. Green plants
    2. B. Viruses
    3. C. Nitrogen-fixing bacteria
    4. D. Herbivores
  15. Random changes in allele frequencies that have the greatest effect in small populations are called what?
    1. A. Natural selection
    2. B. Artificial selection
    3. C. Genetic drift
    4. D. Gene flow

Part 2: Written Response

  1. Compare mitosis and meiosis. Explain why meiosis is necessary for sexual reproduction and how it increases genetic variation.

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