44. Molecular marker cannot be utilized for
(1) Mapping of genes
(2) Identifying the clones
(3) Identifying the locus of gene on chromosome
(4) Identifying the expressed product
Molecular markers cannot be used for identifying the expressed product of a gene.
Explanation of Each Option
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Mapping of Genes: Molecular markers are extensively used for gene mapping. They serve as landmarks on chromosomes to locate genes linked to specific traits or conditions, facilitating the mapping of gene positions on chromosomes.
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Identifying the Clones: Molecular markers can identify clones by detecting specific DNA sequences unique to a clone. This helps distinguish genetically identical or related clones in breeding or research.
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Identifying the Locus of Gene on Chromosome: Molecular markers are crucial for pinpointing the exact locus of genes on chromosomes, aiding in locating genes physically and genetically.
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Identifying the Expressed Product: Molecular markers are DNA sequences and do not provide direct information about gene expression or the proteins/RNA produced by genes. Identifying expressed products requires techniques like proteomics or transcriptomics, not molecular markers.
Introduction:
Molecular markers are essential tools in genetics and molecular biology used for various purposes such as gene mapping, clone identification, and locating gene loci on chromosomes. However, they have limitations, especially when it comes to identifying the expressed products of genes. Understanding both their applications and constraints is crucial in genetic research and breeding programs.
Molecular markers aid in gene mapping by marking specific DNA sequences associated with genes of interest. They help identify clones through unique DNA fingerprints and precisely locate gene loci on chromosomes. However, molecular markers only represent DNA sequences and do not reflect the gene expression or the proteins produced. Therefore, molecular markers cannot be used to identify the expressed products of genes. Techniques like RNA sequencing or protein analysis are required for studying gene expression and the products they generate.
This fundamental distinction highlights the importance of choosing the right molecular tools for genetic studies, depending on whether the focus is on gene identification or gene expression.
This explanation covers all the options by clarifying the roles and limitations of molecular markers in genetics and molecular biology.
