Each haploid nucleus of a mushroom has 9 chromosomes.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Each haploid nucleus of a mushroom has chromosomes. Two hyphae of different strains fuse by plasmogamy. How many nuclei are in the new cell, and how many chromosomes in all? After karyogamy, how many chromosomes has the nucleus? After meiosis, how many chromosomes has each spore?
Need a reminder? The key ideaShow
A fungus has a mycelium of hyphae: septate (with cross walls) or coenocytic (no cross walls, many nuclei). The wall is of chitin and polysaccharides. Fungi are saprophytes, parasites or symbionts (lichens, mycorrhiza). Sexual reproduction: plasmogamy (two cells fuse, ), karyogamy (the nuclei fuse, ), then meiosis (haploid spores, ).
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Plasmogamy. The cytoplasm fuses, and the cell has nuclei (): chromosomes in all.
Step 2. Karyogamy. The two nuclei fuse into one diploid nucleus with chromosomes.
Step 3. Meiosis. The diploid nucleus gives haploid spores, each with chromosomes.
Answer: nuclei and chromosomes; after karyogamy; in each spore.
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