Question & Answers
Molecular Basis of Inheritance
Describe the structure of double helix model of DNA. DNA is made up of two polynucleotide chains, where the backbone is made up of sugar and phosphate groups
What is amniocentesis? A foetal sex-determination test based on the chromosome pattern in the cells found in amniotic fluid surrounding the developing embryo is called amniocentesis.
What is placenta. Mention the functions of placenta. A structural and functional unit present between developing embryo (foetus) and maternal body is called placenta.
Sexual Reproduction in Flowering Plants
What is apomixis and polyembryony? The phenomenon of asexual reproduction that imitates sexual reproduction by the formation of seed without fertilization is called apomixis or agamospermy.
Hardy-Weinberg principle states that allelic frequencies in a population are stable and remains constant from generation to generation, i.e., gene pool (total number of genes and their alleles in a population) is constant.
Microbes in Human Welfare
Discuss the role of Microbes as biofertilizers. Rhizobium is a symbiotic bacterium that lives in the root nodules of legumes and fixes atmospheric nitrogen into organic compounds.
Biotechnology and its applications
What are genetically modified organisms? Genetically modified organisms (GMOs) are plants, bacteria, fungi and animals whose genes have been altered by manipulation.
What is Montreal protocol? Montreal Protocol is an international treaty, was signed at Montreal, Canada, in 1987 to curb the emission of ozone depleting substances.