Biology genetics test questions

🧬 Quick Study Guide

• 🔬 DNA Structure: DNA is a double helix composed of nucleotides. Each nucleotide consists of a deoxyribose sugar, a phosphate group, and a nitrogenous base (Adenine, Thymine, Cytosine, Guanine).
• 🧪 Base Pairing: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G). This is crucial for DNA replication and transcription.
• 🌱 Genes and Alleles: A gene is a segment of DNA that codes for a specific trait. Alleles are different versions of a gene (e.g., for eye color, you might have alleles for blue or brown eyes).
• 👪 Mendelian Genetics: Principles of inheritance including segregation (alleles separate during gamete formation) and independent assortment (genes for different traits assort independently).
• 📊 Punnett Squares: Used to predict the genotypes and phenotypes of offspring based on the genotypes of the parents.
• 🧬 Genotype vs. Phenotype: Genotype refers to the genetic makeup (e.g., BB, Bb, bb), while phenotype refers to the observable traits (e.g., brown eyes, blue eyes).
• 🔄 Mutations: Changes in the DNA sequence that can result in altered protein function. Mutations can be spontaneous or induced by mutagens.

📝 Practice Quiz

1. Which of the following is NOT a component of a nucleotide?
   1. Deoxyribose sugar
   2. Phosphate group
   3. Amino acid
   4. Nitrogenous base
2. In DNA, adenine (A) pairs with:
   1. Guanine (G)
   2. Cytosine (C)
   3. Thymine (T)
   4. Uracil (U)
3. What term describes different versions of a gene?
   1. Codons
   2. Alleles
   3. Chromosomes
   4. Proteins
4. Which principle states that alleles separate during gamete formation?
   1. Independent assortment
   2. Segregation
   3. Dominance
   4. Recessiveness
5. A tool used to predict the genotypes and phenotypes of offspring is called a:
   1. Karyotype
   2. Pedigree
   3. Punnett square
   4. Gel electrophoresis
6. The genetic makeup of an organism is its:
   1. Phenotype
   2. Genotype
   3. Karyotype
   4. Genome
7. What are changes in the DNA sequence called?
   1. Replications
   2. Transcriptions
   3. Mutations
   4. Translations