NEET is an all-India pre-Medical Exam conducted by NTA (National Testing Agency) annually for admission in undergraduate Medical colleges. With the ease of accessibility of resources, the level of competitiveness has increased many folds.
To help the students level up their preparation the experts at Vedantu have compiled a set of authentic study material specially designed for the benefits of the NEET aspirants. In this article, we will learn the following concept of Linkage and Crossing Over.
Table of Content -
Linkage and Crossing Over - An introduction
Difference between Linkage and Crossing Over
Tips for preparation
Frequently Asked Questions
Linkage and Crossing Over are two related, yet different phenomena occurring in Eukaryotic Organisms. Genetic Linkage or, simply, Linkage is the tendency of genes to stay together in a Chromosome while Crossing Over is a phenomenon through which genetic information is exchanged in the germline. Both of these play an important role in heredity. Both the events are somewhat related to each other. However, Linkage is more about the tendency of genes in a Chromosome to inherit together. Through Crossing Over, the Genes separate and segregate into different gametes.
Genetic Linkage means the tendency of the genes or DNA sequences on a chromosome to be inherited together during meiosis of sexual reproduction. Linked genes are the ones located on the same chromosome. For Example, genes on hair colour and eye colour. That is why some individuals inherit hair and eye colours together. Such as black hair with brown eyes or individuals with brown hair and blue eyes inherited from parents.
The exchange of chromosomes between non-sister chromatids to form gametes is Crossing Over. Crossing Over shuffles the alleles on parental chromosomes, so that the gametes carry the combination of genes from mother and father. In simple language, it is the swapping of genetic material in the germline. During meiosis, or the formation of an egg cell and sperm cells, paired chromosomes get aligned so that similar DNA sequences from the paired chromosomes come against one another. This phenomenon accounts for genetic variation in sexually reproducing organisms and it is also essential for the normal segregation of chromosomes.
The Difference Between Linkage and Crossing Over
Crossing Over is the process of separation of genes between homologous pairs into various gametes. Linkage is the tendency of inheriting genes together on the same chromosome.
Linkage occurs when two genes are closer to each other on the same chromosome. On the other hand, Crossing Over takes place when two genes are located far apart on the same chromosome.
Crossing Over may disrupt the gene groups made by Linkage.
Unlike the Linkage, Crossing Over only occurs during the prophase of meiosis I and it produces recombinant alleles, which is not the case in the Linkage.
Tips for preparation -
To boost your level of preparation for the NEET Examination students can try following the steps given below -
First understand the syllabus and Exam pattern of the NEET Exam
Try to cover each and every topic being mentioned in the syllabus, remember to stick to single-source whichever you choose
Start solving past year NEET MCQs to get an idea about the Exam (you can find all the past year solved MCQs on the website of Vedantu)
Learn the new concepts from the solutions of past year paper and evaluate your level of preparation
Make short notes of the new topics as per your understanding
Keep solving more MCQs and have a regular habit of revising your notes
With the blessing of your parents and your dedication to work hard, following these steps will make you crack the NEET Exam with great confidence and clarity.