The following table presents chromosome data on four species of plants and their F₁hybrids:

(a) Deduce the chromosomal origin of species A.
(b) How many bivalents and univalents would you expect to observe at meiotic metaphase I in a hybrid between species C and species B?
(c) How many bivalents and univalents would you expect to observe at meiotic metaphase I in a hybrid between species D and species B?

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Meiosis I Metaphase Root Tip Chromosome Number of Number of Species or F, Hybrid Number Bivalents Univalents A 20 10 B 20 10 10 5 D 10 5 A x B 20 20 15 5 5 15 5 5 AX D 10 10 C × D