Question
What is apomixis? Explain the categories of apomixis.
(i) Apomixis : The phenomenon of formation of embryo(s) by asexual methods without formation of gametes and fertilization is termed as apomixis.
(ii) There are three main categories of apomixis.
1. Recurrent apomixis : In this diploid sporophytic cell, archesporial cell or nucellus form embryos, When diploid megaspore mother cell forms embryo sac it is known as diplospory. It is also called apospory.
2. Non-recurrent apomixis : Haploid embryo sac is formed but the embryos arise either from egg cell or any other haploid cell. It is also known as apogamy.
3. Adventive Embryony : In this in addition to normal zygotic embryo, additional embryos develop from nucellus or integuments. It results in polyembryony.
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S. No.
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Column I
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|
Column II
|
|
A
|
UUU
|
1
|
Termination
|
|
B
|
AUG
|
2
|
Tyrosine
|
|
C
|
UAA
|
3
|
Phenylalanine
|
|
D
|
AGU
|
4
|
Methionine
|
|
E
|
UAC
|
5
|
Serine
|