Suppose there is one member of a particular kind of organism in a culture dish, which doubles itself in one hour through asexual reproduction. Work out the number of members of that kind of organism which will be present in the culture dish after ten hours. Such a colony of individuals arising from one parent is called a clone"."

AcademicBiologyNCERTClass 7

Initial organism: 1

Doubling time, T: 1 hour

Time for culture, t: 10 hours

The number of organisms after time t is calculated using the formula: 

                                   N = No x 2(t/T)

                                   N = 1 x 2(10/1)

                                   N = 1024 organisms.

Thus, after 10 hours, 1024 clones will be present in a Petri dish.

[Extra information:

In a process known as binary fission, bacteria proliferate by dividing into two daughter cells, which constitutes bacterial growth. If no event occurs, the daughter cells that result are genetically identical to the parent cell.


Consequently, bacterial proliferation ensues. Both daughter cells may not necessarily survive the division. However, if the average number of survivors surpasses one, the bacterial population grows exponentially.


Measurement of an exponential bacterial growth curve in batch culture was traditionally taught to all microbiologists; the basic method requires bacterial enumeration (cell counting) via direct and individual (microscopy, flow cytometry), direct and bulk (biomass), or indirect and individual (colony counting) or indirect and bulk (most likely number, turbidity, nutrient uptake) techniques.]

raja
Updated on 10-Oct-2022 12:46:26

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