Genetic Variation Worksheet
Explore the mechanisms and importance of genetic variation in populations with this Grade 12 Biology worksheet.
Includes
Standards
Topics
Genetic Variation
Name:
Date:
Score:
Read each question carefully and answer to the best of your ability. Show all your work where applicable.
1. Which of the following is NOT a primary source of genetic variation?
Mutation
Gene flow
Sexual reproduction
Asexual reproduction
2. Crossing over occurs during which phase of meiosis?
Prophase I
Metaphase I
Anaphase II
Telophase II
3. A change in the DNA sequence is called a .
4. The random distribution of homologous chromosomes to daughter cells during meiosis is known as assortment.
5. Genetic variation is always beneficial to a species.
True
False
6. Gene flow can introduce new alleles into a population.
True
False
7. Explain how mutations contribute to genetic variation.
8. Describe two ways sexual reproduction increases genetic variation in offspring.
9. The diagram below illustrates a DNA double helix. Identify the components labeled A, B, and C.
A:
B:
C: