Test your knowledge: Genes and heredity quiz with answers (Grade 7)

🧬 Quick Study Guide

• 🔬 Genes: These are the basic units of heredity, made of DNA, and they determine our traits. Think of them as instructions for building you!
• 🌱 DNA (Deoxyribonucleic Acid): The molecule that carries genetic information. It has a double helix structure.
• 👪 Heredity: The passing of traits from parents to offspring (kids!). This is why you might have your mom's eyes or your dad's hair.
• 🧮 Alleles: Different versions of a gene. For example, a gene for eye color might have alleles for blue eyes or brown eyes.
• ➕ Dominant Allele: An allele that expresses its trait even if only one copy is present. Represented by a capital letter (e.g., B).
• ➖ Recessive Allele: An allele that expresses its trait only if two copies are present. Represented by a lowercase letter (e.g., b).
• 📊 Genotype: The genetic makeup of an organism (e.g., BB, Bb, bb).
• 👀 Phenotype: The observable characteristics of an organism (e.g., brown eyes, blue eyes).
• ➗ Punnett Square: A tool used to predict the possible genotypes and phenotypes of offspring.

🧪 Practice Quiz

1. Which of the following is the basic unit of heredity?
   1. A. Cell
   2. B. Tissue
   3. C. Gene
   4. D. Organ
2. What does DNA stand for?
   1. A. Deoxyribonucleic Acid
   2. B. Dioxyribonucleic Acid
   3. C. Deoxyribose Nucleic Acid
   4. D. Dioxyribose Nucleic Acid
3. The passing of traits from parents to offspring is called:
   1. A. Evolution
   2. B. Heredity
   3. C. Mutation
   4. D. Adaptation
4. Different versions of a gene are called:
   1. A. Chromosomes
   2. B. Alleles
   3. C. Genotypes
   4. D. Phenotypes
5. Which allele expresses its trait even if only one copy is present?
   1. A. Recessive
   2. B. Dominant
   3. C. Codominant
   4. D. Incomplete Dominant
6. The genetic makeup of an organism is its:
   1. A. Phenotype
   2. B. Genotype
   3. C. Karyotype
   4. D. Allelotype
7. A tool used to predict the possible genotypes of offspring is:
   1. A. Microscope
   2. B. Telescope
   3. C. Punnett Square
   4. D. Graduated Cylinder