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Following are certain statements regarding apomixis in plants:
P. Apomixis cannot be used to maintain hybrid vigour over many generations in plants.
Q. In sporophytic apomixis maternal genotype is maintained.
R. There is an event of meiosis during gametophytic apomixis and is also referred to as apomeiosis.
S. In diplospory, meiosis of the megaspore mother cell is aborted, resulting in two unreduced spores, out of which one forms the female gametophyte.
Which one of the following combinations is correct?
P and Q
P and R
Q and R
Q and S
Answers (1)
Q. In sporophytic apomixis maternal genotype is maintained.
S. In diplospory, meiosis of the megaspore mother cell is aborted, resulting in two unreduced spores, out of which one forms the female gametophyte.
Statement P is incorrect. Apomixis, which involves asexual reproduction, cannot maintain hybrid vigor over many generations since it does not involve the recombination and genetic variation that occur through sexual reproduction.
Statement R is incorrect. Meiosis is not a part of gametophytic apomixis, and it is not referred to as apomeiosis. Gametophytic apomixis involves the development of an embryo from an unreduced egg cell or a modified female gametophyte without the need for fertilization.
Therefore, the correct combination is Q and S. In sporophytic apomixis, the maternal genotype is maintained, and in diplospory, meiosis of the megaspore mother cell is aborted, resulting in two unreduced spores, one of which forms the female gametophyte. Hence, the correct answer is option 4.
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