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Grade 7 Science · Genetics and Heredity

Grade 7 Genetics and Heredity Practice Test

Build Grade 7 Science skills with five 10-question practice tests on DNA, genes, chromosomes, alleles, traits, Punnett squares, mutations, variation, and heredity.

Genetics and Heredity Practice Tests

These Grade 7 Science practice tests use original questions to build genetics and heredity skills. Students practice DNA, genes, chromosomes, alleles, genotype, phenotype, dominant and recessive traits, Punnett squares, pedigrees, mutations, genetic variation, gene expression, and environment-trait relationships.

Skills covered

  • Explaining how DNA, genes, chromosomes, and alleles relate to one another
  • Distinguishing genotype, phenotype, homozygous, heterozygous, dominant, and recessive patterns
  • Using Punnett squares and probabilities to model possible inherited traits
  • Interpreting pedigrees and evidence from family or twin studies
  • Explaining mutations, genetic variation, gene expression, and selective breeding
  • Separating inherited information from environmental effects and acquired changes

How to use these practice tests

For each question, identify the genetic structure or inheritance pattern first. When a cross is given, list the possible allele combinations and remember that probability predicts expected outcomes rather than guaranteeing the result for one individual or family.

For more Grade 7 Science practice, return to the Grade 7 Science category.

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Grade 7 Genetics and Heredity Practice Tests

A 10-question Grade 7 Science practice test on DNA, genes, chromosomes, alleles, traits, Punnett squares, mutations, variation, and heredity.

Read each genetics question carefully, identify the inheritance pattern or genetic structure, and choose the answer supported by the given evidence.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

Which structure contains the information that determines the order of amino acids in a protein?

Please select an answer first.

Correct answer: A

The correct answer is A gene within a DNA molecule.

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: Genes are DNA sequences that contain instructions used to build particular proteins or influence traits.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

Genes are DNA sequences that contain instructions used to build particular proteins or influence traits.

2. QuestionMultiple choice

What usually happens during DNA replication?

Please select an answer first.

Correct answer: B

The correct answer is The DNA molecule is copied so each new cell can receive genetic information..

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: DNA replication produces a copy of the genetic information before cells divide.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

DNA replication produces a copy of the genetic information before cells divide.

3. QuestionMultiple choice

Which mutation could be beneficial in a particular environment?

Please select an answer first.

Correct answer: C

The correct answer is A change that helps an organism survive a disease or find food more effectively.

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: A mutation can be beneficial when its effect improves survival or reproduction under particular conditions.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

A mutation can be beneficial when its effect improves survival or reproduction under particular conditions.

4. QuestionMultiple choice

Which change is least likely to be inherited by offspring?

Please select an answer first.

Correct answer: D

The correct answer is A scar caused by an injury to a body cell.

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: A scar changes a body cell but is not normally encoded in reproductive-cell DNA passed to offspring.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

A scar changes a body cell but is not normally encoded in reproductive-cell DNA passed to offspring.

5. QuestionMultiple choice

Why is genetic variation important in a population?

Please select an answer first.

Correct answer: A

The correct answer is Differences can help some individuals survive when conditions change..

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: Genetic variation provides differences that may be helpful, neutral, or harmful under different conditions.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

Genetic variation provides differences that may be helpful, neutral, or harmful under different conditions.

6. QuestionMultiple choice

What is selective breeding?

Please select an answer first.

Correct answer: B

The correct answer is Choosing organisms with desired traits to reproduce so those traits become more common..

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: Selective breeding uses human choices about reproduction to increase desired inherited traits over generations.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

Selective breeding uses human choices about reproduction to increase desired inherited traits over generations.

7. QuestionMultiple choice

Why can a mutation have no visible effect?

Please select an answer first.

Correct answer: C

The correct answer is The change may not alter an important protein or trait in the organism..

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: Some DNA changes do not affect a protein, occur in a noncritical region, or are hidden by another allele.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

Some DNA changes do not affect a protein, occur in a noncritical region, or are hidden by another allele.

8. QuestionMultiple choice

Why is a mutation in a skin cell usually not passed to offspring?

Please select an answer first.

Correct answer: D

The correct answer is Skin cells are body cells rather than reproductive cells..

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: Only changes in reproductive cells or their precursors are normally passed directly to the next generation.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

Only changes in reproductive cells or their precursors are normally passed directly to the next generation.

9. QuestionMultiple choice

What is the relationship between genes and chromosomes?

Please select an answer first.

Correct answer: A

The correct answer is Genes are sections of DNA arranged on chromosomes..

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: Chromosomes package DNA, and genes are specific DNA sections located along chromosomes.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

Chromosomes package DNA, and genes are specific DNA sections located along chromosomes.

10. QuestionMultiple choice

Which statement best describes an inherited genetic disorder?

Please select an answer first.

Correct answer: B

The correct answer is It results from genetic information that can be passed through reproductive cells..

  1. Identify the heredity concept: Determine whether the question asks about DNA, genes, chromosomes, alleles, traits, probability, mutations, or variation.
  2. Connect genes and traits: Inherited disorders involve genetic variants that can be transmitted from biological parents to offspring.
  3. Check the evidence: Use the allele information, cross, family pattern, or observation to select the scientifically supported answer.

Inherited disorders involve genetic variants that can be transmitted from biological parents to offspring.

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Frequently asked questions about Grade 7 Genetics and Heredity

What is the difference between genotype and phenotype?

Genotype is the allele combination an organism has, while phenotype is the observable or measurable trait that results from genetic information and environmental influences.

Does a Punnett square guarantee the trait of one offspring?

No. A Punnett square predicts probabilities for possible allele combinations. The actual result for one offspring can differ from the expected ratio by chance.

How many questions are on this page?

The page includes five mini tests with 10 questions each, for 50 Grade 7 Genetics and Heredity questions in total.