1. At what stage in the life cycle does the chromosome number change from n to 2n? From 2n to n?
2. Green algae may be classified according to what three presumed lines of evolution?
3. Which one of the lines in the answer to question 2 do you think might be the ancestor of vascular plants?
4. Define the terms isogamy and heterogamy.
5. Define the terms homothallic and heterothallic.
7. Describe two types of conjugation in Spirogyra.
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