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Grade 7 Genetics Vocabulary Worksheet with Answers

Grade 7 (US) · Year 8 (UK) · Class 7 (India) · Science

Unit 7: Going FurtherAdvanced: Grade 8–9 PreviewNGSS MS-LS3-1Advanced

Key genetics terms: gene, allele, dominant, recessive, genotype and phenotype. This free middle 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 7 · Science

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Learning goal: Advanced: Grade 8–9 Preview · NGSS MS-LS3-1

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

Example

What is a section of DNA that codes for a trait called?

Answer: a gene

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 do we call an organism with two identical alleles for a trait?
  2. 2What do we call the passing of traits from parents to offspring?
  3. 3What is the term for an organism's observable traits?
  4. 4Who is known as the father of genetics for his work with pea plants?
  5. 5What is the term for an organism's genetic makeup?
  6. 6What do we call an organism with two different alleles for a trait?
  • AHeredity
  • BPhenotype
  • CHeterozygous
  • DGregor Mendel
  • EGenotype
  • FHomozygous
Part B

Answer each question. Use full sentences where you can.

  1. 7

    Which bases pair together in DNA?

  2. 8

    What shape is a DNA molecule?

  3. 9

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

  4. 10

    What molecule carries genetic information in cells?

  5. 11

    What are the different forms of a gene called?

  6. 12

    What is incomplete dominance?

★ Challenge corner for fast finishers

Why does your breath make fog on a cold window?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/7/genetics_vocabulary

Answer key (click to show)
  1. 1.F — homozygous
  2. 2.A — heredity (inheritance)
  3. 3.B — phenotype
  4. 4.D — Gregor Mendel
  5. 5.E — genotype
  6. 6.C — heterozygous
  7. 7.A with T, and C with G
  8. 8.a double helix
  9. 9.brown
  10. 10.DNA
  11. 11.alleles
  12. 12.neither allele is fully dominant, so the heterozygote shows a blend (e.g. red × white → pink)
  13. ★water vapor in your breath condenses on the cold glass (challenge corner)

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