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Grade 9 Genetics Vocabulary Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Biology

Unit 2: GeneticsInheritanceNGSS HS-LS3-1

Key genetics terms: gene, allele, dominant, recessive, genotype and phenotype. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Genetics Vocabulary

Grade 9 · Biology

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Class

Date

Learning goal: Inheritance · NGSS HS-LS3-1

Directions: This worksheet has 2 parts. Read the instructions at the start of each part.

Example

What are the different forms of a gene called?

Answer: alleles

RememberGenetics words

B dominantshows if presentcapital letterb recessiveshows only as bblower-case letterBB, bbhomozygoustwo the sameBbheterozygousone of eachGenotypethe letters: BbPhenotypewhat you see: brown
Part A

Match each clue to the right word. Write the letter in the box.

  1. 1What is the term for an organism's genetic makeup?
  2. 2What do we call an organism with two different alleles for a trait?
  3. 3In genetics, what do we call a trait that only shows up with two copies of the allele?
  4. 4What is the term for an organism's observable traits?
  5. 5What do we call a permanent change in a DNA sequence?
  6. 6What do we call an organism with two identical alleles for a trait?
  • APhenotype
  • BHeterozygous
  • CMutation
  • DGenotype
  • EHomozygous
  • FRecessive
Part B

Answer each question. Use full sentences where you can.

  1. 7

    Is the genotype Bb homozygous or heterozygous?

    HomozygousHeterozygous
  2. 8

    Which bases pair together in DNA?

  3. 9

    What is incomplete dominance?

  4. 10

    What molecule carries genetic information in cells?

  5. 11

    If B (brown) is dominant to b (blue), what color are the eyes of a person with genotype Bb?

  6. 12

    What shape is a DNA molecule?

★ Challenge corner for fast finishers

If Earth stopped spinning, how long would one day (sunrise to sunrise) be?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/biology/9/genetics_vocabulary

Answer key (click to show)
  1. 1.D — genotype
  2. 2.B — heterozygous
  3. 3.F — recessive
  4. 4.A — phenotype
  5. 5.C — a mutation
  6. 6.E — homozygous
  7. 7.heterozygous
  8. 8.A with T, and C with G
  9. 9.neither allele is fully dominant, so the heterozygote shows a blend (e.g. red × white → pink)
  10. 10.DNA
  11. 11.brown
  12. 12.a double helix
  13. ★about one year (challenge corner)

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