Mapas Genéticos (Linkage) - Aula 18 - Módulo II: Genética | Prof. Gui

Introduction to Genetic Mapping

Overview of the Lesson

• The speaker, Guilherme, introduces himself as a biology teacher and mentions that this is the 19th class in the genetics module, focusing on genetic mapping.

• He emphasizes the importance of watching previous classes for better understanding, particularly the first two lessons.

Key Concepts in Genetic Mapping

• The lesson will cover genetic maps, which are graphical representations of gene positions on chromosomes.

• A genetic map illustrates the distance between genes based on crossover rates; high crossover rates indicate greater distances between genes.

Understanding Crossover Rates

Relationship Between Genes

• The discussion includes an exercise from a federal university that serves as a practical example for understanding genetic maps.

• A hypothetical chromosome is presented with five genes labeled with unique names instead of traditional letters (A, B, C).

Analyzing Gene Distances

• The exercise involves determining distances between genes using a provided table that lists recombination units.

• Students are tasked with identifying specific genes based on their proximity to others using logical reasoning and data from the table.

Practical Application: Solving Genetic Problems

Step-by-Step Problem Solving

• To find gene relationships, students analyze distances measured in recombination units (Morgan).

• The closest gene to one identified is determined through examination of both the map and distance table.

Conclusion of Exercise

• As students work through examples, they identify which genes are closest or farthest apart based on calculated distances.

Understanding Gene Linkage and Crossing Over

Introduction to Logical Deduction in Genetics

• The speaker introduces a logical exercise related to genetics, emphasizing the importance of deduction in solving problems. They mention that there are multiple paths to reach conclusions.

Exploring Gene Proximity

• A scenario is presented where two genes (X and Y) are located close together on a genetic map. The speaker highlights that proximity affects genetic linkage.

Concept of Genetic Linkage

• The speaker explains that when two genes are adjacent with no distance between them, the likelihood of crossing over is zero. This indicates a complete linkage between the genes.

Complete Linkage Explained

• Complete linkage occurs when there is no crossing over between two genes, meaning they remain together during inheritance. This concept is crucial for understanding genetic traits.

Engagement and Further Learning

• The speaker encourages viewers to ask questions if they have doubts about the topic discussed. They express willingness to clarify concepts further.

Community Interaction and Support