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Grade 12 Genetics Basics (Mixed) Worksheet with Answers

Grade 12 (US) · Year 13 (UK) · Class 12 (India) · Biology

Unit 4: ReviewMixed Biology ReviewNGSS 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 12 · Biology

Score___ / 12

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Class

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Learning goal: Mixed Biology Review · NGSS HS-LS3-2

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

Example

Cross Pp × PP. 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 is the term for an organism's genetic makeup?
  2. 2In genetics, what do we call a trait that shows up even with only one copy of the allele?
  3. 3What do we call the passing of traits from parents to offspring?
  4. 4What do we call an organism with two different alleles for a trait?
  5. 5What are the different forms of a gene called?
  • AHeredity
  • BAlleles
  • CHeterozygous
  • DDominant
  • EGenotype
Part B

Answer each question. Use full sentences where you can.

  1. 6

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

    YYYY
  2. 7

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

    yyYY
  3. 8

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

    TTtt
  4. 9

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

    PPPP
  5. 10

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

    WWWw
  6. 11

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

    WwWw
  7. 12

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

    yyYy

★ 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/12/genetics_basics

Answer key (click to show)
  1. 1.E — genotype
  2. 2.D — dominant
  3. 3.A — heredity (inheritance)
  4. 4.C — heterozygous
  5. 5.B — alleles
  6. 6.all dominant (4 : 0)
  7. 7.100%
  8. 8.all dominant (4 : 0)
  9. 9.all dominant (4 : 0)
  10. 10.100%
  11. 11.1 WW : 2 Ww : 1 ww
  12. 12.50%
  13. ★the match (challenge corner)

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