The Jaina Doctrine of Karma And The Science Of Genetics ► [2.2] Life In The Science Of Genetics ► ▪ Quantity Of Chromosomes In Some Animal Cells

Posted: 13.03.2009

Cell of the body is provided with a pocket of genetic material, the nucleus, which contains chromosomes. Normally all the individual of a species have fixed number of chromosomes in their nuclei. The characteristic group of chromosomes in a cell is spoken of its complement. Generally the somatic cells of animal and higher plants are diploid (i.e. they have two sets of chromosomes 2n) while their gametes, as a rule, are haploid as they contain only one set of chromosomes. The number of chromosomes present in gametes is referred to as haploid or genetic chromosome number or 'n'. In diploid organisms half of the chromosomes of a nucleus are contributed by the female gamete (maternal chromosome) in the sexual reproduction. The haploid set of chromosomes is also known as genome.

 

(a) Table - Chromosome number of some animals

S. No.

Name of animal

Diploid chromosome number (2n)

01.

Paramecium

30-40

02.

Hydra

32

03.

Round worm

2

04.

Solk worm

56

05.

House fly

12

06.

Fruit fly

8

07.

Honey bee

32, 16

08.

Mosquito

6

09.

Frog

26

10.

Chicken

78

11.

Pigeon

80

12.

Mouse

40

13.

Rabbit

44

14.

Common rat

42

15.

Guinea pig

64

16.

Dog

78

17.

Cat

38

18.

Horse

64

19.

Pig

40

20.

Goat

60

21.

Chimpanzee

48

22.

Man

46

 

 

(b) Table - Chromosome number of some plants

S. No.

Name of plant

Diploid chromosome number (2n)

01.

Chlamydomonas

10, 12, 16 (halpoid ser)

02.

Bread mold

2

03.

Yellow pine

24

04.

Cabbage

18

05.

Radish

18

06.

Paraya

18

07.

Cotton

52

08.

Coffee

44

09.

Sunflower

34

10.

Potato

48

11.

Tomato

24

12.

Tobacco

48

13.

Banana

22, 44, 55, 77, 88

14.

Garden pea

14

15.

Bean

22

16.

Orange

18, 27, 36

17.

Apple

34, 51

18.

Indian corn

20

19.

Barley

14

20.

Bread wheat

42

21.

Rice

20

22.

Bajra

10, 20, 40

23.

Sugarcane

80

24.

Field bean

12

25.

Onion

16

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