Bio Sci H97: Honors Genetics – Course Syllabus and Study Guide

Course Overview

This course, Bio Sci H97: Honors Genetics, provides an in-depth exploration of the molecular and classical principles of genetics. It covers the molecular basis of heredity, gene expression, genetic mapping, population genetics, and modern applications such as genomics and genetic counseling. The course is structured around lectures, discussions, readings, quizzes, and homework assignments to reinforce key concepts in genetics.

Course Structure and Components

• Lectures: Cover foundational and advanced topics in genetics, following a logical progression from DNA structure to population genetics and genomics.

• Discussions: Focus on applying concepts through activities such as genome browser exercises, gene interaction analysis, and the Human Gene Project.

• Assignments: Include pre-class readings, mini quizzes, genetics homework, and participation in discussions.

• Exams: Two midterms and a final exam assess understanding of course material.

Major Topics and Subtopics

DNA Structure and Replication

Understanding the physical and chemical structure of DNA is fundamental to genetics. This topic covers the double helix model, nucleotide composition, and the mechanisms by which DNA is replicated in cells.

• Key Points:

  • DNA is composed of nucleotides (adenine, thymine, cytosine, guanine) forming a double helix.

  • Replication is semi-conservative, with each new DNA molecule containing one parental and one new strand.

• Example: Meselson-Stahl experiment demonstrating semi-conservative replication.

Gene Expression: Transcription and Translation

Gene expression involves the processes by which genetic information is transcribed from DNA to RNA and then translated into proteins. Regulation of these processes ensures proper cellular function.

• Transcription: Synthesis of RNA from a DNA template by RNA polymerase.

• RNA Processing: Includes capping, polyadenylation, and splicing in eukaryotes.

• Translation: Conversion of mRNA sequence into a polypeptide chain at the ribosome.

• Equation: $\text{DNA} \xrightarrow{\text{transcription}} \text{mRNA} \xrightarrow{\text{translation}} \text{Protein}$

• Example: The lac operon as a model for gene regulation in bacteria.

Transmission Genetics

This topic explores how genetic traits are inherited from one generation to the next, including Mendelian and non-Mendelian patterns of inheritance.

• Mendelian Inheritance: Laws of segregation and independent assortment.

• Pedigree Analysis: Used to track inheritance patterns in families.

• Equation: $P(Aa \times Aa) \rightarrow 1:2:1$ genotype ratio in offspring.

• Example: Inheritance of cystic fibrosis as an autosomal recessive trait.

Gene Interaction and Epistasis

Genes can interact in complex ways to influence phenotypes. Epistasis occurs when one gene masks or modifies the effect of another gene.

• Types of Gene Interaction: Complementation, suppression, and synthetic lethality.

• Epistasis Example: Coat color in Labrador retrievers, where one gene affects pigment deposition.

Chromosome Structure and Abnormalities

Chromosomes are the physical carriers of genetic information. Structural changes can lead to genetic disorders.

• Key Points:

  • Chromosome number and structure are analyzed in karyotypes.

  • Abnormalities include deletions, duplications, inversions, and translocations.

• Example: Down syndrome caused by trisomy 21.

Genetic Linkage and Mapping

Genes located close together on the same chromosome tend to be inherited together. Genetic mapping uses recombination frequencies to determine gene order and distance.

• Equation: $\text{Recombination Frequency} = \frac{\text{Number of Recombinants}}{\text{Total Offspring}} \times 100\%$

• Application: Mapping disease genes in humans.

Gene Mutation, DNA Repair, and Homologous Recombination

Mutations are changes in DNA sequence that can affect gene function. Cells have evolved mechanisms to repair DNA and maintain genetic integrity.

• Types of Mutations: Point mutations, insertions, deletions, and chromosomal rearrangements.

• DNA Repair Mechanisms: Mismatch repair, nucleotide excision repair, homologous recombination.

• Example: Xeroderma pigmentosum caused by defects in nucleotide excision repair.

Population Genetics and Evolution

Population genetics examines the distribution of alleles in populations and how they change over time due to evolutionary forces.

• Hardy-Weinberg Principle: Describes allele and genotype frequencies in a non-evolving population.

• Equation: $p^2 + 2pq + q^2 = 1$

• Forces of Evolution: Mutation, selection, genetic drift, migration.

Genomics and Genetic Counseling

Modern genetics includes the study of entire genomes and the application of genetic information in medicine and counseling.

• Genomics: Analysis of DNA sequences, gene expression, and genetic variation on a genome-wide scale.

• Genetic Counseling: Involves advising individuals and families about genetic risks and testing options.

• Example: Use of genome-wide association studies (GWAS) to identify disease-associated variants.

Course Schedule Highlights

Week	Topic
1-2	DNA Structure, Replication, and Transcription
3-4	Gene Expression and Regulation
5-6	Transmission Genetics, Pedigrees
7-8	Gene Interaction, Chromosome Structure
9-10	Linkage, Mapping, Mutation, and Repair
11-12	Population Genetics, Genomics, Genetic Counseling

Required Materials

• Textbook: "Genetic Analysis: An Integrated Approach" (Sanders and Bowman)

• Mastering Genetics: Online homework and resources

• Calculator: For quantitative problems

Evaluation and Grading

• Midterm Exams: 32% (16% each)

• Final Exam: 32%

• Homework: 16%

• Mini Quizzes: 10%

• Discussion Participation: 10%

Academic Integrity and Conduct

• All students are expected to adhere to UCI's academic honesty policies.

• Collaboration is encouraged for learning, but all submitted work must be individual unless otherwise specified.

• Sharing or distribution of course materials is prohibited.

Additional Info

• Office hours and discussion sections provide opportunities for additional support and clarification of course material.

• Accommodations are available for students with documented needs.