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Genetics and Heredity Practice Tests

These Grade 9 Biology practice tests explain how DNA, genes, chromosomes, and alleles carry information from one generation to the next. Questions cover Mendelian inheritance, Punnett squares, meiosis, mutations, pedigrees, genetic variation, and basic biotechnology.

Skills covered

  • Distinguishing DNA, genes, chromosomes, alleles, genotype, and phenotype
  • Applying dominant, recessive, homozygous, heterozygous, incomplete dominance, codominance, and sex-linked inheritance concepts
  • Using Punnett squares and probability to predict possible offspring genotypes and phenotypes
  • Connecting meiosis, crossing over, independent assortment, fertilization, and chromosome number to genetic variation
  • Interpreting mutations, pedigrees, karyotypes, natural selection, and introductory genetic engineering

How to use these practice tests

Start by identifying the gene, allele, chromosome, or inheritance pattern involved. For crosses, write the parental alleles and list the possible gametes before calculating the probability. Review each explanation to strengthen genetics vocabulary and evidence-based reasoning.

For more Grade 9 Science practice, return to the Grade 9 Science category.

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1. Test

Grade 9 Genetics and Heredity Practice Tests

Practice Grade 9 Science questions about DNA, genes, chromosomes, alleles, Mendelian inheritance, Punnett squares, meiosis, mutations, pedigrees, and genetic variation.

Choose the best answer. Identify the genetic information or inheritance pattern, apply the relevant rule, and use probabilities carefully when interpreting crosses.

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

What is the main role of DNA in a cell?

Please select an answer first.

Correct answer: A

The correct answer is Storing genetic instructions..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: DNA stores the instructions that cells use to build proteins and regulate many biological processes.
  3. Check the answer: The correct answer is Storing genetic instructions..

DNA stores the instructions that cells use to build proteins and regulate many biological processes.

2. QuestionMultiple choice

What is a gene?

Please select an answer first.

Correct answer: B

The correct answer is A segment of DNA that contains information for a functional product or trait..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: A gene is a section of DNA that contributes information for a functional RNA, protein, or heritable trait.
  3. Check the answer: The correct answer is A segment of DNA that contains information for a functional product or trait..

A gene is a section of DNA that contributes information for a functional RNA, protein, or heritable trait.

3. QuestionMultiple choice

What is a chromosome?

Please select an answer first.

Correct answer: C

The correct answer is A DNA molecule packaged with proteins..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: Chromosomes are organized structures made of DNA and associated proteins that carry genes.
  3. Check the answer: The correct answer is A DNA molecule packaged with proteins..

Chromosomes are organized structures made of DNA and associated proteins that carry genes.

4. QuestionMultiple choice

Which base-pairing rule is correct for DNA?

Please select an answer first.

Correct answer: D

The correct answer is Adenine pairs with thymine, and cytosine pairs with guanine..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: Complementary base pairing in DNA is A with T and C with G, which helps DNA copy accurately.
  3. Check the answer: The correct answer is Adenine pairs with thymine, and cytosine pairs with guanine..

Complementary base pairing in DNA is A with T and C with G, which helps DNA copy accurately.

5. QuestionMultiple choice

What are the three parts of a DNA nucleotide?

Please select an answer first.

Correct answer: A

The correct answer is A sugar, a phosphate group, and a nitrogen-containing base..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: Each DNA nucleotide contains deoxyribose sugar, a phosphate group, and one nitrogen-containing base.
  3. Check the answer: The correct answer is A sugar, a phosphate group, and a nitrogen-containing base..

Each DNA nucleotide contains deoxyribose sugar, a phosphate group, and one nitrogen-containing base.

6. QuestionMultiple choice

Where is most DNA located in a typical eukaryotic cell?

Please select an answer first.

Correct answer: B

The correct answer is In the nucleus..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: The nucleus contains most of a eukaryotic cell's DNA, although mitochondria and chloroplasts also contain some DNA.
  3. Check the answer: The correct answer is In the nucleus..

The nucleus contains most of a eukaryotic cell's DNA, although mitochondria and chloroplasts also contain some DNA.

7. QuestionMultiple choice

What does gene expression describe?

Please select an answer first.

Correct answer: C

The correct answer is The use of genetic information to produce a functional product or affect a trait..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: Gene expression is the process by which information in a gene is used, often to make RNA or a protein.
  3. Check the answer: The correct answer is The use of genetic information to produce a functional product or affect a trait..

Gene expression is the process by which information in a gene is used, often to make RNA or a protein.

8. QuestionMultiple choice

What is a mutation?

Please select an answer first.

Correct answer: D

The correct answer is A change in the DNA sequence..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: A mutation changes the nucleotide sequence and may have neutral, harmful, or beneficial effects.
  3. Check the answer: The correct answer is A change in the DNA sequence..

A mutation changes the nucleotide sequence and may have neutral, harmful, or beneficial effects.

9. QuestionMultiple choice

What is an organism's genotype?

Please select an answer first.

Correct answer: A

The correct answer is The allele combination it carries..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: Genotype refers to the genetic makeup or allele combination, while phenotype refers to observable traits.
  3. Check the answer: The correct answer is The allele combination it carries..

Genotype refers to the genetic makeup or allele combination, while phenotype refers to observable traits.

10. QuestionMultiple choice

What is an organism's phenotype?

Please select an answer first.

Correct answer: B

The correct answer is Its observable traits, influenced by genes and the environment..

  1. Identify the genetics concept: Determine whether the question asks about DNA, alleles, inheritance, meiosis, variation, or genetic evidence.
  2. Apply the inheritance principle: Phenotype includes observable characteristics that result from genetic information and environmental influences.
  3. Check the answer: The correct answer is Its observable traits, influenced by genes and the environment..

Phenotype includes observable characteristics that result from genetic information and environmental influences.

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