Genetic Variation Worksheet
Explore the concepts of genetic variation, DNA, and how traits are passed down through generations in this Grade 7 Science worksheet.
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Genetic Variation
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Date:
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Read each question carefully and answer to the best of your ability. Show your work where applicable.
1. What is the primary source of genetic variation in sexually reproducing organisms?
Asexual reproduction
Mutations
Genetic engineering
Sexual reproduction
2. Which of the following is the basic unit of heredity?
Cell
Organ
Gene
Tissue
3. Genetic variation is important because it allows populations to to changing environments.
4. The complete set of genetic material in an organism is called its .
5. All offspring from the same parents are genetically identical.
True
False
6. Mutations are always harmful to an organism.
True
False
7. Describe the structure of a DNA molecule. You may refer to the diagram below.
8. Explain how genetic variation benefits a species.
Match each term on the left with its definition on the right.
9. Gene
a. A change in the DNA sequence
10. Allele
b. Different forms of a gene
11. Mutation
c. A segment of DNA that codes for a specific trait