Molecular Basis of Inheritance
ICSE · Class 12 · Biology
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Explore the full setWhat is a gene?
Answer
A gene is a unit of information that directs the activity of a cell or organism during its lifetime. It also passes its message to the progeny when the cell or organism divides or reproduces.
Who coined the term gene, and when?
Answer
The term gene was coined by W. Johannsen in 1909.
What are cistron, recon, and muton?
Answer
Cistron is the continuous segment of DNA that specifies one polypeptide chain. Recon is the smallest unit that gives rise to new forms by recombination. Muton is the smallest length of DNA capable of …
What are the main properties of genes as genetic material?
Answer
Genes determine physical and metabolic characteristics, are situated in chromosomes, occur in several genes on each chromosome, occupy fixed positions, are arranged in linear order, can exist in diffe…
What is the role of genes in inheritance?
Answer
Genes carry hereditary information, help in faithful replication, allow occasional mutation, and store the instructions needed to control the functions of a cell.
What did Friedrich Miescher discover?
Answer
Friedrich Miescher isolated nuclein from pus cell nuclei in 1869. Nuclein was later renamed nucleic acid by Altmann in 1889.
What are nucleotides made of?
Answer
A nucleotide has three parts: a nitrogenous base, a pentose sugar, and phosphoric acid. Nucleotides join by phosphodiester bonds to form polynucleotide chains.
What is the difference between DNA and RNA sugar and bases?
Answer
DNA contains deoxyribose sugar and the bases adenine, guanine, cytosine, and thymine. RNA contains ribose sugar and the bases adenine, guanine, cytosine, and uracil. Uracil replaces thymine in RNA.
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