Can asexual reproduction be the cause of genetic variations

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Discussion Overview

The discussion centers on the relationship between asexual reproduction and genetic variation, particularly in the context of plant reproduction and the role of meiosis and mitosis. Participants explore concepts such as spores, gametes, and the alternation of generations, aiming to clarify how these processes contribute to genetic diversity.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant asserts that spores produced during asexual reproduction via meiosis should lead to genetic variations due to the nature of meiosis.
  • Another participant introduces the concept of alternation of generations, clarifying that the production of gametes is not asexual and that meiosis causes genetic recombination.
  • A different viewpoint challenges the classification of pollen grains as gametes, suggesting they are spores that give rise to gametes through mitosis.
  • Further clarification is provided that anything with one set of chromosomes is considered a gamete, while those with two sets are not, emphasizing the complexity of terminology related to spores and gametes.
  • One participant expresses concern over the terminology used, indicating that the word "spore" can be confusing and has multiple meanings, particularly in the context of asexual reproduction.

Areas of Agreement / Disagreement

Participants express differing views on the classification of pollen grains and the definitions of spores and gametes. There is no consensus on the terminology or the implications of asexual reproduction on genetic variation.

Contextual Notes

Participants highlight the complexity and potential confusion surrounding the terms "spore" and "gamete," indicating that definitions may vary among different biological contexts and disciplines.

Nikhil faraday
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In plants , Spores are produced ( asexual reproduction) as a result of meiosis , so there should be genetic variations as meiosis causes genetic variations! please help to clarify the concept
 
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I guess:
You are talking about Alternation of Generations - gametophyte and sporophyte. And the production of gametes is NOT asexual. So the answer is: yes. Meiosis always "scrambles" DNA in chromosome pairs when crossing over occurs. It is sometimes called recombination. In evolutionary terms it is known as 'meiotic drive'.

Somewhere you got the word 'spore' misplaced in your understanding. Flowering plants produce meiotically generated spores (gametes): pollen grains, for example. Not part of asexual reproduction.

Cell division or mitosis is the driving force for asexual reproduction. Gametophytes like molds can make spores by mitosis, even though they are haploid.

All of this gets messy and confusing to students when you look at fungi, because most times, the organisms we can see are gametophytes - they have half the normal number of chromosomes.
 
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But I think that pollen grains are not gametes , they are Spores and the gametes are produced from them by Mitosis.
 

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Anything with one n chromosomes is a gamete in the sense of gametophyte. Production of more cells by mitosis does not change that.
Anything with two n chromosomes is not a gamete in the sense of gametophyte versus sporophyte.

I see what your drawing shows, and yes they use the word "spore". IMO, bad choice. Why? Because you are confused by it. Spore has multiple meanings. It usually means asexual reproduction. You are correct in that usage. Why? If your instructor thinks that is the correct way to go you are stuck with it.

If you talk to a Botanist they will explain it a little differently.
 
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