binary fision

What is binary fision?

Process by which prokaryotic organisms like bacteria divide and reproduce

Why is binary fission not the same as mitosis or meiosis?

Because mitosis and meiosis happen in eukaryotic cells and binary fission happens in prokaryotic cells

How does bacteria multiply?

By binary fission

Before bacterial cell can divide what things does it need to do?

Grow - so it’s big enough too give rise of 2 new cells

Next it has to replicate genetic material ( circular strand of DNa and plasmid )so there’s enough for new cell

What is the process of binary fission?

1- The circular DNA and plasmid replicate

2-The cell gets bigger and the circular DNA strands move to opposite poles(ends) of the cell so the offspring cells will get one each

3) The plasmids are arranged randomly, so one offspring cells may end up getting more than other

4)The cytoplasm begins to divide and new cell wall begins to form

5)when complete allows 2 halves to pull up apart creating two new bacterial cells

How quickly can bacterial populations grow?

Bc binary fission is a simple process it doesn’t take much time meaning some bacteria(e.g. coli ) can divide once every 20 minutes given right conditions

What does the mean division( time )depend on?

Species and the condition bacteria is in

What condition is good for optimal bacteria growth?

Warm moist plenty of nutrients

Practice question

A bacterial cell has a mean division of 30 minutes how many cells would it produce after 3 hours?

First work out how many division cycles there are in 3 hours- do 3hrs=180 minutes divided by 30 =6

Then work out how many cells it would make- by taking original cell which is 1 and multiplying it by 2 six times

1×2×2×2×2×2×2= 64

So 64 cells are produced after 3 hours

what happens if conditions of bacteria bevcome unfavourable?

The cells will stop dividing and eventually begin to die