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.

MEDIUM

Earn 100

"All unicellular organisms undergo only mitotic cell division during favourable conditions”- Do you support this statement? Why?

Important Questions on Continuity of Life

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Life Science>Biology>Continuity of Life>Cell Division

The minimum number of plants to be screened to obtain a plant of the genotype

AabbCcDd

from a cross between plants of genotypes

AaBbCcDd

and

AABbCCDd

is:

EASY

Life Science>Biology>Continuity of Life>Cell Division

Which of the following is not a divisional stage

EASY

Life Science>Biology>Continuity of Life>Cell Division

Which ONE of the following statements is INCORRECT?

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Life Science>Biology>Continuity of Life>Cell Division

If the gene pool of the locus X in the human genome is 4, then what would be the highest possible number of genotypes in a large population?

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Life Science>Biology>Continuity of Life>Cell Division

Identify the correct feature of Amitosis cell division -

EASY

Life Science>Biology>Continuity of Life>Cell Division

A pure breeding pea plant with round yellow seeds was crossed with pea plant having wrinkled green seeds. On selfing of

F_{1}

, hybrid of his cross,

64

progenies were obtained in

F_{2}

generation. Find out the number of

F_{2}

progenies showing non-parental characters.

EASY

Life Science>Biology>Continuity of Life>Cell Division

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

HARD

Life Science>Biology>Continuity of Life>Cell Division

Who is the father of Genetics? Write three laws of heredity.

HARD

Life Science>Biology>Continuity of Life>Cell Division

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.

MEDIUM

Life Science>Biology>Continuity of Life>Cell Division

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?

EASY

Life Science>Biology>Continuity of Life>Cell Division

How many types of gametes can be produced by individual with the genotype AAbb?

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Life Science>Biology>Continuity of Life>Cell Division

Write one feature of epithelial tissue.

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Life Science>Biology>Continuity of Life>Cell Division

Give appropriate biological or technical terms for the following:

The condition in which a pair of chromosomes carry similar alleles of a particular character.

EASY

Life Science>Biology>Continuity of Life>Cell Division