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Grade 10 Genetics Basics (Mixed) Worksheet with Answers

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

Unit 3: Cell Division & GeneticsInheritanceNGSS 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 10 · Biology

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Class

Date

Learning goal: Inheritance · NGSS HS-LS3-2

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

Example

In genetics, what do we call a trait that only shows up with two copies of the allele?

Answer: recessive

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 do we call an organism with two different alleles for a trait?
  3. 3What molecule carries genetic information in cells?
  4. 4What do we call a permanent change in a DNA sequence?
  5. 5What is the term for an organism's observable traits?
  6. 6In genetics, what do we call a trait that shows up even with only one copy of the allele?
  • AAlleles
  • BDNA
  • CPhenotype
  • DHeterozygous
  • EDominant
  • FMutation
Part B

Answer each question. Use full sentences where you can.

  1. 7

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

    wwWw
  2. 8

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

    TtTt
  3. 9

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

    BBbb
  4. 10

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

    rrRr
  5. 11

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

    YYyy
  6. 12

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

    RRRR

★ Challenge corner for fast finishers

Does a kilogram of feathers weigh more than a kilogram of iron?

How did I do?

Teacher's comments

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

Answer key (click to show)
  1. 1.A — alleles
  2. 2.D — heterozygous
  3. 3.B — DNA
  4. 4.F — a mutation
  5. 5.C — phenotype
  6. 6.E — dominant
  7. 7.2 Ww : 2 ww
  8. 8.75%
  9. 9.all dominant (4 : 0)
  10. 10.2 : 2
  11. 11.4 Yy
  12. 12.100%
  13. ★no — they weigh the same (challenge corner)

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