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bio unit 2 pp question

(iii) In the control, after two hours, all the pollen tubes contained gametes. After two hours in the presence of cycloheximide (CH), none of the pollentubes contained gametes. Suggest which process in pollen grains could be inhibited by cycloheximide (CH).

how is the answer here not meiosis????? ;/
the markscheme says mitosis
can someone please explain ,, thanks xx
Reply 1
Avatar for RMNDK
RMNDK
3
Original post by pondsteps
(iii) In the control, after two hours, all the pollen tubes contained gametes. After two hours in the presence of cycloheximide (CH), none of the pollentubes contained gametes. Suggest which process in pollen grains could be inhibited by cycloheximide (CH).

how is the answer here not meiosis????? ;/
the markscheme says mitosis
can someone please explain ,, thanks xx


Is that all it says?
Is it saying that CH is added to the same pollen tubes and after two hours, the gametes disappear?

Or is it saying that CH is added to a new set of pollen tubes and after two hours, no gametes are present?

If it's the former, then mitosis would be the answer. That's because the gametes would multiply by mitosis to increase their numbers, but if CH is interfering in mitosis, e.g. inhibiting DNA replication, they can't divide and so die.

If it's the latter, then I probably would've put meiosis down as the answer. Because meiosis can still occur and produce the gametes.
Original post by RMNDK
Is that all it says?
Is it saying that CH is added to the same pollen tubes and after two hours, the gametes disappear?

Or is it saying that CH is added to a new set of pollen tubes and after two hours, no gametes are present?

If it's the former, then mitosis would be the answer. That's because the gametes would multiply by mitosis to increase their numbers, but if CH is interfering in mitosis, e.g. inhibiting DNA replication, they can't divide and so die.

If it's the latter, then I probably would've put meiosis down as the answer. Because meiosis can still occur and produce the gametes.

yup the first answer was what the q asked for.... but gametes are produced by meiosis what has mitosis got to di with this .. like the gametes are produced!! :///
Reply 3
Avatar for batoot
batoot
11
Original post by pondsteps
yup the first answer was what the q asked for.... but gametes are produced by meiosis what has mitosis got to di with this .. like the gametes are produced!! :///
er no, in animals gametes are produced by meiosis, plant gametes are produced by mitosis

Spoiler

Original post by batoot
er no, in animals gametes are produced by meiosis, plant gametes are produced by mitosis

Spoiler


Ohhh yes! Thanks a lot x

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