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Apomixis
The formation of sporophyte from the gametophyte without sexual process signifies apomixis. It relates to the replacement of alternation of a reduced gametophyte and an unreduced sporophyte by an unreduced gametophyte and sporophyte. It occurs in relatively in about 35 families. The most common being Asteraceae and Poaceae. Apomixis can be classified into two types, recurrent (in non- reduced embryo sacs) and non-recurrent (in reduced embryo sacs). The later relates to development of haploid embryos without the actual fusion of gametes.
Figure: Diagrammatic representation of Apomixis types
TYPES OF CELL WALL Cell wall differentiated into the following layers : 1. Primary Cell Wall 2. Secondary Cell wall 3. Tertiary Cell wall 1 .
It is conversion of antibody class to another resulting from genetic rearrangement of heavy chain same region genes in B cells. Isotope switching is also known as class switching.
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