Answer the following questions based on the size of the organism and its chromosomes. (a) Do larger organisms have more number of chromosomes/cells? (b) Can organisms with fewer chromosomes reproduce more easily than organisms with more number of chromosomes? (c) More the number of chromosomes/cells, greater is the DNA content. Justify.

Asked by Srishti Mallick | 19th Feb, 2014, 03:16: PM

Expert Answer:

(a) There is no relationship between the number of chromosomes and the size or the complexity of the organism. Example: Ophioglossum reticulatum are small ferns that have 630 pairs of chromosomes. Humans have 23 pairs of chromosomes while a horse has 32 pairs.

(b) The ability of an organism to reproduce depends on a variety of factors like availability of nutrients, water, conducive environment and suitable mate. There is no relationship of the number of chromosomes with the ease with which organisms reproduce.

(c) It is not that more is the number of chromosomes/cells, greater is the DNA content. The size of chromosomes can also vary. So, a species could have 100 very small chromosomes and still have less DNA than another species with 10 very large chromosomes. 

Answered by  | 20th Feb, 2014, 11:23: AM

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