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Articles by Anusha Karthik
Page 5 of 12
QTL Mapping - An Overview
An Overview Quantitative Trait Locus (QTL) mapping is a statistical technique used to identify the chromosomal regions responsible for the variation of a quantitative trait. The identification of QTLs is essential in understanding the genetic basis of complex traits and for the development of improved breeding strategies. An attempt has been made below to give an overview of QTL mapping, including the methodology, data analysis, and interpretation of results. Methodology of QTL Mapping The process of QTL mapping involves four primary steps: trait measurement, genotyping, statistical analysis, and QTL validation. Trait Measurement The first step in QTL mapping is to ...
Read MoreMAS in Backcross and Heterosis Breeding
Introduction In the field of plant breeding, it is often necessary to combine desirable traits from two or more different varieties of plants. One way to achieve this is through the use of backcross breeding and heterosis breeding. Backcross breeding involves crossing a hybrid plant with one of its parents in order to transfer desirable traits from the parent to the hybrid. Heterosis breeding involves crossing two genetically distinct plants to create a hybrid that has improved traits compared to both parents. One of the key tools used in both backcross and heterosis breeding is the marker-assisted selection (MAS) ...
Read MoreMap-Based Gene/QTL Isolation
Introduction One of the most challenging aspects of modern genetic research is the identification of the genes responsible for a particular trait or disease. Genetic mapping techniques have been developed to identify quantitative trait loci (QTLs), which are regions of the genome that contribute to a trait. QTL mapping is a powerful approach to identifying genes that contribute to complex traits such as height, weight, and susceptibility to disease. The content below aims to discuss map-based gene/QTL isolation, which is a technique used to isolate the gene responsible for a particular QTL. What is QTL Mapping? Quantitative trait loci ...
Read MoreGenetic and Physical Maps the Relation Between Them
Introduction Genetic maps and physical maps are two types of maps that help us understand the structure of the genome. The genome is the complete set of genetic instructions that an organism inherits from its parents. Genetic maps and physical maps provide different types of information about the genome, but they are related in important ways. Genetic Maps Genetic maps are maps of the relative positions of genes on a chromosome. Genes are segments of DNA that carry the instructions for making a particular protein. Genetic maps are constructed by analysing the patterns of inheritance of different genetic traits. If ...
Read MoreGene Mapping for Qualitative and Quantitative Traits
Introduction Gene mapping is a critical process in modern genetics that involves identifying the locations of genes on chromosomes. This process can be used to study both qualitative and quantitative traits, which are two types of traits that vary in their patterns of inheritance. Qualitative traits are traits that are controlled by one or a few genes and are usually expressed in discrete categories, such as eye colour or blood type. Quantitative traits, on the other hand, are traits that are controlled by multiple genes and are usually expressed in a continuous range of values, such as height or weight. ...
Read MoreDifference Between Hybridization and Introgression
An Overview Hybridization and introgression are two different but often conflated concepts in biology. Hybridization refers to the mating of individuals from different species or populations to produce offspring with mixed genetic characteristics, while introgression refers to the transfer of genetic material from one species or population to another through repeated hybridization and backcrossing. While both processes involve the mixing of genetic material, they have distinct genetic and evolutionary consequences. The content below explores the differences between hybridization and introgression, their mechanisms, and their importance in evolutionary biology. Mechanisms of Hybridization and Introgression Hybridization occurs when individuals from different species ...
Read MoreDifference Between Foreground and Background Selection
Introduction Plant breeding is the process of altering the genetic makeup of a plant species to create new, more desirable varieties. It involves selecting certain individuals from a population and breeding them to produce offspring with specific traits. One of the key techniques used in plant breeding is foreground and background selection. Foreground and background selection are methods of identifying desirable traits in a population of plants. These methods are used to select plants that have specific traits and are more likely to produce offspring with those traits. This article aims at noting the difference between foreground and background selection ...
Read MoreDevelopment of Gene-Based Markers and Their Applications
Introduction In recent years, the development of gene-based markers has revolutionized the way scientists’ study genetic variation in organisms Gene-based markers are specific segments of DNA that are associated with particular genes and can be used to identify genetic variation in populations. These markers have numerous applications in a variety of fields, including agriculture, medicine, and ecology. The article sheds light on the development of gene-based markers, their applications, and their potential for future research. Development of Gene-Based Markers The development of gene-based markers began with the discovery of restriction enzymes, which are enzymes that can cut DNA at specific ...
Read MoreAssociation Mapping or Linkage Disequilibrium Mapping Of QTL
Introduction Genetic mapping is a crucial tool in the study of inheritance and evolution. It allows us to locate the genes that underlie traits of interest, such as disease susceptibility, crop yield, or even behavior. Two main types of genetic mapping are used in modern research − Association mapping. Linkage mapping. The article below focuses on association mapping and linkage disequilibrium (LD) mapping of quantitative trait loci (QTL). We will explain the basic principles behind these methods, their advantages and limitations, and how they are used in research today. Association Mapping Association mapping, also known as genome-wide association ...
Read MoreAllele Mining by TILLING and Eco-TILLING
Introduction Allele mining has emerged as a powerful approach to identify novel genetic variations that can be used to improve crop traits. TILLING (Targeting Induced Local Lesions IN Genomes) and Eco-TILLING (Ecotype Targeting Induced Local Lesions IN Genomes) are two widely used methods for allele mining in plants. These techniques rely on the use of mutagenic agents to introduce random mutations into the plant genome, followed by screening for mutations in target genes of interest. In this article, we will provide a detailed overview of TILLING and Eco-TILLING and their applications in allele mining. TILLING TILLING was first developed ...
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