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Stuck on biology mitosis/meiosis question

With Question 2a of this paper, I am confused as to why B is mitosis, why D is mitosis, and why E is meiosis. https://www.ocr.org.uk/Images/408992-question-paper-unit-h020-02-depth-in-biology.pdf
Original post by jess_ssej00
With Question 2a of this paper, I am confused as to why B is mitosis, why D is mitosis, and why E is meiosis. https://www.ocr.org.uk/Images/408992-question-paper-unit-h020-02-depth-in-biology.pdf


It comes down to the ploidy of the parent and daughter cells. Meiosis reduces by half, ie 2n to n or diploid to haploid whereas in mitosis, identical daughter cells are produces i.e. ploidy is maintained, i.e. haploid -> haploid.
Original post by jess_ssej00
With Question 2a of this paper, I am confused as to why B is mitosis, why D is mitosis, and why E is meiosis. https://www.ocr.org.uk/Images/408992-question-paper-unit-h020-02-depth-in-biology.pdf




B - It's a Gametophyte as it says in the question and it also says it is a haploid cell, so it undergoes mitosis instead of meiosis as it's not a diploid.

D - Again, it's already a haploid cell. Similar reasoning to above

E - Meiosis because a Zygote is a diploid cell and in order to progress onto the next stage (2n -> n) it needs to become a haploid cell and only meiosis does this.
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jess_ssej00
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Original post by Blue_Cow
B - It's a Gametophyte as it says in the question and it also says it is a haploid cell, so it undergoes mitosis instead of meiosis as it's not a diploid.

D - Again, it's already a haploid cell. Similar reasoning to above

E - Meiosis because a Zygote is a diploid cell and in order to progress onto the next stage (2n -> n) it needs to become a haploid cell and only meiosis does this.

Thank you=)
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jess_ssej00
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Original post by Kvothe the Arcane
It comes down to the ploidy of the parent and daughter cells. Meiosis reduces by half, ie 2n to n or diploid to haploid whereas in mitosis, identical daughter cells are produces i.e. ploidy is maintained, i.e. haploid -> haploid.

Thank you :smile:

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