7 public questions tagged with this topic.
Gel electrophoresis is used to separate DNA fragments based on size, with smaller fragments migrating faster in the gel.
Ref: NCERT Class 12 Biology Chapter 9: Biotechnology: Principles and Processes Processes - Isolation of DNA and Gel Electrophoresis
The Human Genome Project aimed to identify all human genes and determine the complete DNA sequence of the human genome.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Human Genome Project and DNA Fingerprinting
Somatic cell hybridization fuses human cells with rodent cells usually mouse creating heterokaryons containing both genomes that subsequently lose human chromosomes randomly during mitotic divisions while retaining mouse complement stably. Clones retaining different sets of human chromosomes screened for human-specific enzyme activity or DNA marker presence allow assignment of gene to particular chromosome via concordance analysis. Panel of hybrids with overlapping retention patterns refines regional localisation pioneering human gene mapping before recombinant DNA techniques enabling first ph
Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 12: Somatic Cell Hybrids for Physical Mapping
Run-off transcription is an in vitro biochemical assay designed to study promoter strength and transcription factor requirements. A DNA template containing a promoter followed by a defined sequence is linearized downstream with restriction enzymes, causing RNA polymerase to transcribe and then fall off at the cut site, producing a transcript of fixed length. Reactions include labeled UTP and nuclear extracts or purified factors. Quantity of RNA synthesized is measured by autoradiography. Northern blot detects steady-state RNA, SAGE quantifies tags, and ChIP assesses protein occupancy, not tran
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
DNA microarray technology miniaturizes hybridization assay onto a solid support. The platform consists of glass slides, silicon chips, or membrane substrates onto which tens of thousands of known synthetic oligonucleotides or cDNAs are robotically spotted or in situ synthesized at defined coordinates. Each spot contains millions of copies of a specific probe representing a gene or transcript. Labeled sample cDNA hybridizes to complementary spots under stringent conditions. Fluorescence intensity quantifies abundance. Gel and capillary tube formats relate to electrophoresis, while microscopy sl
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
Tandem repeats create duplicated restriction recognition sites at regular intervals, altering expected fragment number and size predictably. Simple single enzyme digestion that should linearize plasmid may instead produce multiple bands or an unusually large fragment if repeats are head-to-tail and sites are duplicated. Restriction mapping using several enzymes, double digests, and comparison of observed versus predicted fragment patterns reveals duplications, insertions, or rearrangements. While PCR and sequencing can ultimately confirm repeat structure, initial screening by restriction mappi
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.
According to the NCERT Biological Classification chapter, several members of Ascomycetes have massive economic or scientific importance. While Claviceps and Aspergillus are notable, 'Neurospora' is explicitly highlighted as being utilized extensively and heavily in fundamental biochemical and genetic work. It served as the primary model organism that helped scientists decipher fundamental genetic pathways and the one-gene-one-enzyme hypothesis in early biology.
Ref: NCERT Class 11 Biology > Chapter 2: Biological Classification > 2.3 Kingdom Fungi
