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Grade 10 Punnett Squares & Crosses Worksheet with Answers

Grade 10 (US) · Year 11 (UK) · Class 10 (India) · Biology

Unit 3: Cell Division & GeneticsInheritanceNGSS 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 10 · Biology

Score___ / 12

Name

Class

Date

Learning goal: Inheritance · NGSS HS-LS3-3

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

Example

In dogs, the allele for wire-haired coat (W) is dominant over the allele for smooth coat (w). What trait does a Ww dog show?

Answer: wire-haired coat

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

    YYyy
  2. 2

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

    YYYy
  3. 3

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

    RRrr
  4. 4

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

    TTTT
  5. 5

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

    BbBB
  6. 6

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

    wwWW
  7. 7

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

    bbBb
  8. 8

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

    WWww
  9. 9

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

    wwww
  10. 10

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

    TtTt
  11. 11

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

    Pppp
  12. 12

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

    TTtt

★ Challenge corner for fast finishers

You are in a closed room with a candle, a match and a lamp. What do you light first?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/biology/10/genetics_punnett

Answer key (click to show)
  1. 1.all dominant (4 : 0)
  2. 2.2 YY : 2 Yy
  3. 3.100%
  4. 4.100%
  5. 5.100%
  6. 6.all dominant (4 : 0)
  7. 7.2 Bb : 2 bb
  8. 8.all dominant (4 : 0)
  9. 9.all recessive (0 : 4)
  10. 10.75%
  11. 11.2 Pp : 2 pp
  12. 12.100%
  13. ★the match (challenge corner)

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