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Mitosis vs meiosis (b2 edexcel)
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Adam Jan
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Hi guys. I have a problem. I still struggle to describe the differences and processes and examples of mitosis and meiosis. I understand everything except for this sub topic. Thanks
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texet
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State everything you know about each of them. What the replicates are created for, what they can do... etc. Then see what the differences are. Start there. If not, I can explain it to you, if someone else doesn't.
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Rawnblade
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#3
(Original post by Adam Jan)
Hi guys. I have a problem. I still struggle to describe the differences and processes and examples of mitosis and meiosis. I understand everything except for this sub topic. Thanks
Hi guys. I have a problem. I still struggle to describe the differences and processes and examples of mitosis and meiosis. I understand everything except for this sub topic. Thanks
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Adam Jan
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(Original post by Rawnblade)
Mitosis is the type of cell division that duplicates a cell and creates an exact copy of it. Like cell division in a zygote. Meiosis is the type of cell division that produces daughter cells with half the number of chromosomes, like in a sperm and an egg
Mitosis is the type of cell division that duplicates a cell and creates an exact copy of it. Like cell division in a zygote. Meiosis is the type of cell division that produces daughter cells with half the number of chromosomes, like in a sperm and an egg
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Adam Jan
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(Original post by texet)
State everything you know about each of them. What the replicates are created for, what they can do... etc. Then see what the differences are. Start there. If not, I can explain it to you, if someone else doesn't.
State everything you know about each of them. What the replicates are created for, what they can do... etc. Then see what the differences are. Start there. If not, I can explain it to you, if someone else doesn't.
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anna.tr
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#6
(Original post by Adam Jan)
I understand the general theme of them but where do keywords like haploids and diploids come into play?
I understand the general theme of them but where do keywords like haploids and diploids come into play?
diploid = containts 46 chromosomes in nucleus so the daughter cells produced by mitosis would be referred to as diploid daughter cells.
just mention the keywords in your answers
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Adam Jan
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(Original post by anna.tr)
haploid = contains 23 chromosomes in nucleus so you would describe the daughter cell/gamete produced by meiosis as haploid cells/gametes
diploid = containts 46 chromosomes in nucleus so the daughter cells produced by mitosis would be referred to as diploid daughter cells.
just mention the keywords in your answers
haploid = contains 23 chromosomes in nucleus so you would describe the daughter cell/gamete produced by meiosis as haploid cells/gametes
diploid = containts 46 chromosomes in nucleus so the daughter cells produced by mitosis would be referred to as diploid daughter cells.
just mention the keywords in your answers
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00sevenmagic
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(Original post by Adam Jan)
Hi guys. I have a problem. I still struggle to describe the differences and processes and examples of mitosis and meiosis. I understand everything except for this sub topic. Thanks
Hi guys. I have a problem. I still struggle to describe the differences and processes and examples of mitosis and meiosis. I understand everything except for this sub topic. Thanks
Mitosis and Meiosis
Homologous – matching chromosomes
Mitosis – cell division to produce clone
Haploid – A cell containing half the normal number of chromosomes
Zygote – A fertilised egg cell
Meiosis – Cell Division to produce gametes in sexual organs
Gamete – Sex cell
Diploid – A cell containing two copies of each chromosome
Mitosis
To make more cells during growth and/or to repair damaged cells, body cells divide by a process called mitosis:
1. Chromosomes first make copies of themselves called DNA replication
2. The copies of the chromosomes separate and then the cell divides
3. This division produces two daughter cells, which are genetically identical Diploid cells and are identical to the daughter cell:
Diploid (each daughter cell has 46 chromosomes in their nucleus so they have two copies of each chromosome)
Mitosis can occur in asexual reproduction
Asexual reproduction is when organisms reproduce by themselves
Bacterial cells often reproduce asexually by splitting in half, some plants can also reproduce asexually
Sexual reproduction makes new being – requires two gametes and fuse to produce zygote
Meiosis
Cell division to produce haploid gametes
1. First step is DNA replication (this first step is the same as in mitosis)
2. This is followed by two cell divisions - i.e. the cell is first divided into two and then divided again into four
3. This produces 4 haploid daughter cells, each containing one set of (23) chromosomes (i.e. the haploid daughter cells have half the number of chromosomes in the nucleus than diploid cells)
Chromosome pairs in a diploid cell contain the same genes but may have different versions of the genes (i.e different ‘alleles’) because they come from different parents -- chromosomes in a pair are slightly different
In meiosis, these slightly different chromosomes are split between the daughter cells in a random wayàthe haploid gametes produced in meiosis are genetically different from each other
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Rawnblade
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#9
(Original post by Adam Jan)
I understand the general theme of them but where do keywords like haploids and diploids come into play?
I understand the general theme of them but where do keywords like haploids and diploids come into play?
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anna.tr
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#10
(Original post by Adam Jan)
omg it all makes sense now. thanks so much
omg it all makes sense now. thanks so much
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