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lifescience* 11-26-2006 07:28 AM

This is about mitosis and cells! need answers asp
 
1)how are cells in the region behind the onion root tip fifferent from those in the onion root tip!!
2)compare the chromosomes of whitefish cells(animal cells) and onion root tip cells(plant cells)
plz help me i need this for monday
plz respond asp
love,
brooke:) :angel:

dreamerofeternity 01-29-2007 01:18 PM

Quote:

Originally Posted by lifescience* (Post 11765)
1)how are cells in the region behind the onion root tip fifferent from those in the onion root tip!!
2)compare the chromosomes of whitefish cells(animal cells) and onion root tip cells(plant cells)
plz help me i need this for monday
plz respond asp
love,
brooke:) :angel:

Those cells in the onion roots are undergoing mitosis, because it's constantly growing. The cells behind the onion root tip has already undergone mitosis and is already specialized (no longer dividing). Think of it as mitosis=giving birth to a new cell to keep on growing. The root tip keeps on dividing, the cells beyond root tip has already grown up.

Second, whitefish cells are animal cells, and two cells must combine to form one embryo to become one fish. Therefore, whitefish cells undergo meosis. You should research the difference b/w meoisis and mitosis. But generally, meoisis is for animal reprodcution and divides the number of chromosomes in half, while mitosis is for continual cell growth and keeps the same number of chromosomes.

sciencefreak 04-05-2008 07:28 PM

although dreamer seems to have covered the basics of your question, here are a few additions. onion root tip cells undergo rapid cell division for growth (meristem) while the cells behind do undergo division but at a slower pace.

the difference between mitosis and meiosis is that:

1) chromosome no. is halved in meiosis so it is reductional division for reproductive cells while mitosis is equational division

2) meiosis allows exchange of genetic material (synapsis) so the daughter cells have characters from both the parent cells while in mitosis the daughter cell is an exact copy of the parent cell.

these are the basic difference. others include no. of daughter cells, region of division etc.

p.s. although i'm really late in my reply for you, maybe others wit a similar question can go through this post for help


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