i know the entire process of mitosis, meiosis in detail. but one thing strikes me that how do the daughter cells acquire their cell organelles? do the organelles get divided and thereafter get distributed? or are they produced by the cells after division? if it is so, what happens to those posessed by the parent cell? please also give info about mitochondria and chloroplast which possess 70S ribosomes and are capable of fission. any extra info or links are welcomed. i would be really grateful to your answers.
2007-03-16 02:16:22 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Biology
My understanding is that organelles like mitochondria and chloroplasts replicate on their own within the cell cytoplasm, so when the cell divides, both daughter cells get a distribution of these organelles.
For example, during meiosis in a female, the resulting ovum gets the mitochondria from the parent cell. However, during fertilization, what little mitochondria are in the sperm cells do not survive the fertilization process ... so the resulting zygote gets all its mitochondria from the ovum (the mother).
2007-03-16 19:44:25 · answer #1 · answered by secretsauce 7 · 0⤊ 0⤋
I have never actually been told what the organelles do and have always assumed that they would split in the cytoplasm depending on where they were.
Once the DNA has been shared out, there should be enough DNA to make the RNA to make the proteins to make new organelles.
Mitochondria might well divide on their own under their own set of stimuli. I'm not sure about chloroplasts.
Looks like you're right - chloroplasts have their own division separate from cell division.
2007-03-16 09:25:39 · answer #2 · answered by Orinoco 7 · 0⤊ 0⤋
once the dna is copied it has the info to make new organelles in the daughter cell and the parent cell keeps their own organelles. as for chloroplast and mitochondria...i'm not sure if the daughter cell makes their own and then they replicate themselves or if the parent cell's replicate and donate them to the daughter. i've never heard of organelle donation like that so my guess would be that the dna codes for all the organelles. then if more mitochondria are needed, such as in muscle cells, they go through fission to meet the demand.
2007-03-16 09:22:12 · answer #3 · answered by molly b 2 · 0⤊ 0⤋
during interphase all the organelles are doubled
2007-03-16 09:24:32 · answer #4 · answered by Hzl 4 · 0⤊ 0⤋