A plant species has 2n = 18 chromosomes. How many chromosomes would you expect to find in a tetrasomic individual of this species?

Name: A plant species has 2n = 18 chromosomes. How many chromosomes would you expect to find in a tetrasomic individual of this species?
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A tetrasomic individual has an extra pair of homologous chromosomes, so it would have 2n + 2 chromosomes. For this species, 2n = 18, so a tetrasomic individual would have 18 + 2 = 20 chromosomes.

A Plant Species Has 2n = 18 Chromosomes