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Linkage Group & Morgan's Theory Video Lecture | Biology for ACT

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FAQs on Linkage Group & Morgan's Theory Video Lecture - Biology for ACT

1. What is a linkage group in genetics?
Ans. In genetics, a linkage group refers to a group of genes that are located on the same chromosome. These genes are said to be linked because they tend to be inherited together due to their physical proximity on the chromosome. Understanding linkage groups is crucial for studying the inheritance patterns of genes and the formation of genetic maps.
2. How did Thomas Hunt Morgan contribute to the theory of linkage groups?
Ans. Thomas Hunt Morgan, an American geneticist, conducted extensive research on fruit flies and made significant contributions to the theory of linkage groups. He discovered that certain traits in fruit flies were inherited together more frequently than others, which led him to propose the concept of gene linkage. Morgan's experiments and observations provided evidence for the existence of genes being located on specific chromosomes and laid the foundation for the understanding of linkage groups in genetics.
3. What is the significance of understanding linkage groups in genetic research?
Ans. Understanding linkage groups is crucial in genetic research as it helps in determining the relative positions of genes on a chromosome and their patterns of inheritance. By studying linkage groups, researchers can identify genes that are physically close to each other and tend to be inherited together. This information is used to create genetic maps, which are essential for studying the genetic basis of various traits and diseases, as well as for selective breeding and gene mapping.
4. How are linkage groups and genetic mapping related?
Ans. Linkage groups and genetic mapping are closely related concepts in genetics. Linkage groups provide information about the physical proximity and inheritance patterns of genes on a chromosome. This information is then used to create genetic maps, which depict the locations of genes on a chromosome. Genetic mapping involves determining the order and distances between genes on a chromosome. Linkage groups form the basis for creating accurate genetic maps, which are essential for various genetic studies.
5. Can genes in a linkage group ever be separated during genetic recombination?
Ans. Yes, genes in a linkage group can be separated during genetic recombination, although the frequency of separation depends on the distance between the genes on the chromosome. Genetic recombination occurs during the process of meiosis, where genetic material is exchanged between homologous chromosomes. If two genes in a linkage group are located far apart on the chromosome, they have a higher chance of being separated during recombination. Conversely, if the genes are located close together, they are less likely to be separated. The frequency of recombination can be used to estimate the distance between genes on a chromosome.
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