b2.7 mitosis and meiosis
TRANSCRIPT
MitosisWALT: To understand how cells divide by a process called mitosis which results in two daughter cells being produced. WILF: ~ State a definition for mitosis and what is produced as a result. (D)~ Describe how mitosis occurs. (C)~ Explain when mitosis occurs. (B)~ Explain the role of mitosis in asexual reproduction. (A/A*)Keywords
mitosis diploid chromosomes daughter cells asexual
reproduction
In human cells, you will find 46 chromosomes (23 pairs) Diploid number
To make more body cells, these cells must divide, a process called mitosis.
Parent cell
Daughter cells
Why?
For growth
For repair
Mitosis and cancer
Keywords
NucleusChromosomesDiploidDNA replicationParent cellDaughter cell
Questions1.What is a diploid cell
and how many chromosomes does a human diploid cell have?
2.Explain why mitosis must occur.
3.Define asexual reproduction and name examples of when this happens.
MeiosisWALT: To understand how sex cells (gametes) are produced by another type of cell division, meiosis. WILF: ~ State a definition for meiosis and gametes. (D)~ Describe how meiosis occurs. (C)~ Explain differences between mitosis and meiosis. (B)~ Explain the importance of meiosis in relation to variation. (A/A*)
Keywords
meiosis haploid gametes sexual reproduction
variation
Gametes (Sex cells)egg cell
sperm cell
diploid cell
haploid cells
zygote
Sexual reproduction requires sex cells, also known as…
These cells are different to body cells because…
When gametes fuse during fertilisation, they produce a…Keywords
GametesHaploidZygote
MeiosisTo produce gametes, a different type of cell division must happen, meiosis.
1st cell division-separates the pair of chromosomes.
2nd cell division-separates the copies of each chromosome.
Making gametes-Meiosis
1. You start off with a ___________ cell, which contains pairs of _____________.
2. The chromosomes then _____________ (like they do in mitosis).
3. The __________ cell ___________ now happens, the pairs of chromosomes separate.
4. The second cell division then happens. This produces ____ ____________ cells. Each cell gets a copy of one chromosome from each pair.
These 4 cells are known as being _________, as they have half the amount of chromosomes.This type of cell division is known as ___________.
KeywordsChromosomesReplicateMeiosisHaploidDiploidFirst4DivisionDaughter
Making gametes-Meiosis
1. You start off with a ___________ cell, which contains pairs of _____________.
2. The chromosomes then _____________ (like they do in mitosis).
3. The __________ cell ___________ now happens, the pairs of chromosomes separate.
4. The second cell division then happens. This produces ____ ____________ cells. Each cell gets a copy of one chromosome from each pair.
These 4 cells are known as being _________, as they have half the amount of chromosomes.This type of cell division is known as ___________.
KeywordsChromosomesReplicateMeiosisHaploidDiploidFirst4DivisionDaughter
Mitosis vs. meiosis
Mitosis Meiosis
No. of cell divisions?
No. of daughter cells formed?
Diploid or haploid cells produced?
Needed for…?
Daughter cells identical?
Use your notes on mitosis and meiosis to fill in this table of differences between the two processes.
Mitosis Meiosis
No. of cell divisions?
No. of daughter cells formed?
Diploid or haploid cells produced?
Needed for…?
Daughter cells identical?
Mitosis Meiosis
No. of cell divisions?
No. of daughter cells formed?
Diploid or haploid cells produced?
Needed for…?
Daughter cells identical?
Mitosis Meiosis
No. of cell divisions?
No. of daughter cells formed?
Diploid or haploid cells produced?
Needed for…?
Daughter cells identical?
Mitosis Meiosis
No. of cell divisions?
No. of daughter cells formed?
Diploid or haploid cells produced?
Needed for…?
Daughter cells identical?
Mitosis Meiosis
No. of cell divisions?
1
No. of daughter cells formed?
4
Diploid or haploid cells produced?
haploid
Needed for…? Producing gametes (sex cells).
Daughter cells identical?
Yes
Mitosis Meiosis
No. of cell divisions?
1
No. of daughter cells formed?
4
Diploid or haploid cells produced?
haploid
Needed for…? Producing gametes (sex cells).
Daughter cells identical?
Yes
Mitosis Meiosis
No. of cell divisions?
1
No. of daughter cells formed?
4
Diploid or haploid cells produced?
haploid
Needed for…? Producing gametes (sex cells).
Daughter cells identical?
Yes
Mitosis Meiosis
No. of cell divisions?
1
No. of daughter cells formed?
4
Diploid or haploid cells produced?
haploid
Needed for…? Producing gametes (sex cells).
Daughter cells identical?
Yes