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Grade 11 Punnett Squares & Crosses Worksheet with Answers

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

Unit 2: HeredityCrosses & ProbabilityNGSS HS-LS3-3

Predicting offspring with Punnett squares and working out genotype and phenotype ratios. 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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Punnett Squares & Crosses

Grade 11 · Biology

Score___ / 12

Name

Class

Date

Learning goal: Crosses & Probability · NGSS HS-LS3-3

Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.

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
  1. 1

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

    WWww
  2. 2

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

    BBBb
  3. 3

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

    bbbb
  4. 4

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

    RrRR
  5. 5

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

    Rrrr
  6. 6

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

    TtTT
  7. 7

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

    ttTt
  8. 8

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

    rrrr
  9. 9

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

    WwWW
  10. 10

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

    yyYy
  11. 11

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

    BbBB
  12. 12

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

    BbBb

★ 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/biology/11/genetics_punnett

Answer key (click to show)
  1. 1.100%
  2. 2.100%
  3. 3.all recessive (0 : 4)
  4. 4.all dominant (4 : 0)
  5. 5.50%
  6. 6.2 TT : 2 Tt
  7. 7.2 Tt : 2 tt
  8. 8.4 rr
  9. 9.all dominant (4 : 0)
  10. 10.2 Yy : 2 yy
  11. 11.100%
  12. 12.75%
  13. ★water vapor in your breath condenses on the cold glass (challenge corner)

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