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Grade 11 Genetics Basics (Mixed) Worksheet with Answers

Grade 11 (US) · Year 12 (UK) · Class 11 (India) · Biology

Unit 2: HeredityCrosses & ProbabilityNGSS HS-LS3-2

A mixed set on genetics vocabulary and Punnett square crosses. 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 Basics (Mixed)

Grade 11 · Biology

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Name

Class

Date

Learning goal: Crosses & Probability · NGSS HS-LS3-2

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

Example

Cross WW × ww. What percentage of offspring are expected to show the dominant trait?

Answer: 100%

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 are the different forms of a gene called?
  2. 2What shape is a DNA molecule?
  3. 3What is the term for an organism's genetic makeup?
  4. 4What is the term for an organism's observable traits?
  5. 5What do we call the passing of traits from parents to offspring?
  • AHeredity
  • BAlleles
  • CPhenotype
  • DDouble helix
  • EGenotype
Part B

Answer each question. Use full sentences where you can.

  1. 6

    Cross WW × Ww. What is the expected ratio of dominant to recessive phenotypes?

    WWWw
  2. 7

    Cross rr × rr. What is the expected ratio of dominant to recessive phenotypes?

    rrrr
  3. 8

    Cross yy × yy. What percentage of offspring are expected to show the dominant trait?

    yyyy
  4. 9

    Use a Punnett square to cross yy × yy. What is the expected genotype ratio (out of 4)?

    yyyy
  5. 10

    Use a Punnett square to cross ww × WW. What is the expected genotype ratio (out of 4)?

    wwWW
  6. 11

    Cross Yy × yy. What is the expected ratio of dominant to recessive phenotypes?

    Yyyy
  7. 12

    Cross Bb × Bb. What is the expected ratio of dominant to recessive phenotypes?

    BbBb

★ Challenge corner for fast finishers

Ice floats in water. What does that tell you about its density?

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Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/biology/11/genetics_basics

Answer key (click to show)
  1. 1.B — alleles
  2. 2.D — a double helix
  3. 3.E — genotype
  4. 4.C — phenotype
  5. 5.A — heredity (inheritance)
  6. 6.all dominant (4 : 0)
  7. 7.all recessive (0 : 4)
  8. 8.0%
  9. 9.4 yy
  10. 10.4 Ww
  11. 11.2 : 2
  12. 12.3 : 1
  13. ★ice is less dense than liquid water (challenge corner)

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