Molecular Basis of Inheritance
A single fertilised egg holds the whole plan of a person, written in a molecule so thin that two metres of it fit inside a nucleus. How did scientists find out that this molecule, and not a protein, carries the plan? In this chapter you follow the experiments that settled it and then build the double helix, base by base. You see how it is packed, how it is copied before a cell divides, how a gene is read into RNA and how the RNA is turned into a protein. You also meet the switch that lets a bacterium use lactose only when it is there, the project that read the whole human genome, and the DNA fingerprint. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP. Python counts bases, codons and generations.
Part of Biology · High School (11–12) (chapter 23)
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DNA as the Genetic Material: Experiments, Structure and Packaging
Which molecule carries the plan of a living thing, a protein or a nucleic acid? You follow three famous experiments, then build DNA and RNA from their nucleotides and use the rules of base pairing to count. At the end you see how two metres of DNA are packed into one nucleus. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.
Replication and Transcription: Copying and Reading the Gene
A cell must copy all of its DNA before it divides, and it must read a gene before it can make a protein. You see how Meselson and Stahl showed that each new DNA keeps one old strand. Then you meet the enzymes of replication, the leading and the lagging strand, and the way a gene is copied into RNA and finished in the nucleus. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.