Distinguish between mitotic and meiotic cell division in animals on the basis of the following features: Site of occurrence Nature of division of chromosomes Number of cells produced List the changes in the sense organs and bones that occurred during the senescence phase of human development.

Features Mitotic cell Meiotic cell Site of occurrence This division takes place in somatic cells. This division takes place in germ cells. Features Mitotic cell Meiotic cell Nature of division of chromosomes Crossing over does not take place. Crossing over takes place in which the exchange of segments of chromatids occurs. Features Mitotic cell Meiotic cell Number of cells produced Mitotic cell gives two nuclei, and hence two cells. Meiosis gives four nuclei or cells. The changes in the sense organs and bones that occurred during the senescence phase of human development are listed below: Ageing includes a decline in accommodation, glare tolerance, adaptation, low-contrast activity, attentional visual fields and colour discrimination. Changes occur in central processing and in the components of the eye. Ageing causes conductive and sensory hearing losses, the loss is primarily high tones, making consonants in speech difficult to discriminate. Normal ageing is characterised by a decrease in bone and muscle mass and an increase in adiposity. A decline in muscle mass and a reduction in muscle strength lead to risk of fractures, frailty, reduction in the quality of life and loss of independence. These changes in musculoskeletal system reflect the ageing process as well as consequences of a reduced physical activity.

Mitosis is a type of cell division that results in two daughter nuclei. Each contains a similar number of a chromosome as the parent nuclei. The main purpose of mitosis is for growth and to replace worn out cells.

The diagram shows a certain stage in cell division in a cell with four chromosomes : What is the diploid number for the organism from which the cell is taken?

The given diagram is showing the metaphase stage of the plant cell. The mitosis produces two daughter cells that are genetically identical to the parent cell. The diploid number for the organism is 2n, from which it is taken from the parent cell.

EASY

Earn 100

Genetic recombination occurs in _____ phase of prophase of meiosis-I.

Important Questions on Life Processes in Living Organisms Part -1

EASY

Science>Biology>Life Processes in Living Organisms Part -1>Cell Division: An Essential Life Process

DNA synthesis occurs in which stage of cell cycle.

EASY

Science>Biology>Life Processes in Living Organisms Part -1>Cell Division: An Essential Life Process

In typical cell divisions by mitosis and meiosis, all of the following contributes to genetic variation except :

EASY

Science>Biology>Life Processes in Living Organisms Part -1>Cell Division: An Essential Life Process

Which of the following is not a divisional stage

MEDIUM

Science>Biology>Life Processes in Living Organisms Part -1>Cell Division: An Essential Life Process

How can you distinguish between mitosis of plant cells and that of animal cells on the basis of formation of spindle fibre and the process of cytokinesis?

HARD

Science>Biology>Life Processes in Living Organisms Part -1>Cell Division: An Essential Life Process

Distinguish between mitotic and meiotic cell division in animals on the basis of the following features: