Transformation of cell
rubabTransformation is the genetic alteration of a cell resulting from the introduction, uptake and expression of foreign genetic material (DNA or RNA). In 1928 Frederick Griffith transforms nonpathogenic pneumococcus bacteria…
TRANSDUCTION
Transduction is the process by which bacterial DNA is moved from one bacterium to another by a virus. It was first discovered by Joshua Lederberg in 1952. The most striking…
CONJUGATION & GENE RECOMBINATION IN E.COLI
The transfer of genetic material between bacteria through cell-to-cell contact is called bacterial conjugation. It is a mechanism of horizontal gene transfer. Bacterial conjugation is often incorrectly regarded as sexual…
PHOTOPERIODISM
sanaThe response of plant to the relative length of light and dark period is called photoperiodism. I here are number of plants responses controlled FA photoperiods. Some of these are:…
Morphological Characters of Flowers
sidraThe highly specialized shoot which is responsible for the production of fruits and seeds is called flower. Flowers are concerned with the sexual reproduction. Flower has following pans. 1.Sepals: Sepals…
OBJECTIVES OF REPRODUCTION IN CELL
Multiple Choice Questions (MCQs) Phragmoplast is formed from: (a) Ribosome (b) ER (c) Golgi body (d) None Chromosomes start condensing in: (a) Leptotene (b) Zygotene (c) Pachytene (d) Diplotene The…
SUBJECTIVE & SHORT QUESTIONS OF REPRODUCTION IN CELL
SUBJECTIVE QUESTIONS 1- What is mitosis? Describe its different stages. Compare the mitosis in plants and animals. Give significance of mitosis. Describe process of meiosis. Give importance of mitosis. Give…
DEFINITIONS AND KEY POINTS OF REPRODUCTION IN CELL
TERMS DEFINITIONS Phragmoplast Membranous vesicles are collected in the centre. Membrane structure phragtnoplast is formed from vesicles. Meiosis The special type of cell division in which…
THE CELL CYCLE
The period from the time a cell is produced until it completes mitosis is called cell cycle. Cell division occurs during growth and repair processes. Cell cycle has following basic…
MEIOSIS
The special type of cell division in which the numbers of chromosomes in 'tighter cells are reduced to one half, as compared to the p. rent cells is called meiosis.…