Mendelian genetics

This presentation will examine Mendelian genetics with a focus on the fundamental principles of Mendelian genetics, including how Gregor Mendel's experiments with P plants establish the ideas of dominance, segregation, and independent assortment. We will explore key concepts such as genotype, phenotype, and the use of Punit squares to predict inheritance patterns. The lecture will also discuss Mendel's two foundational laws and how they apply to both simple and more complex genetic traits in humans and other organisms. Finally, we will address the ongoing importance of Mendelian principles in genetic research and real world applications. Mendelian genetics refers to the patterns of inheritance described by Gregor Mendel, an Austrian monk in the 19th century, through experiments with pea plants. Mendel observed that traits like pea color and shape followed predictable patterns across generations, contradicting the then popular blended inheritance theory. He discovered that traits are controlled by discrete units called genes with alternative forms known as alleles. Mendel's work introduced key genetic concepts like dominance, segregation and independent assortment. A central observation in Mendelian genetics is the distinction between dominant and recessive traits. Dominant alleles mask recessive alleles. A recessive trait is only expressed if two copies of the recessive allele are present. For example, when Mendel crossed yellow pea plants with green, all offspring were yellow showing yellow is dominant.