BIOL 209 Lecture Notes - Lecture 8: Pezizomycotina, Basidiomycota, Ascomycota
Document Summary
Like most fungi, sexual reproduction is initiated when conditions start to get rough: e. g starvation, winter = sex initiated. Gametangia structures producing gametes: male gametes are mostly making up the nuclei, male part -> antheridia (-ium) is a thin hyphae which grows towards the female of the opposite mating type. It follows the female pheromone which is a chemical signal inducing biological behavior: female part -> ascogonia (pl. ) (s. ium) are thick hypha packed with nutrients. In phylum basidiomycota, the alleles at two different loci, a and b, which must be different in order to have mating occur. In ascomycota the gene at a single locus, mat, controls mating: t(cid:449)o (cid:858)idio(cid:373)orphs(cid:859) or (cid:272)o(cid:373)pletely dissimilar sets of genes are called mat1 or. Mat2: mat1 hypha x mat2 hypha is compatible. Idiomorph genes at same mat locus completely different: hermaphrodites 1 mycelium (1n) which makes antheridia and ascogonia, but male and female must differ at mat locus for mating to occur.
