A botanist identifies a new species of plant that has 32 chromosomes. It grows in the same habitat with three similar species: species A (2n = 14), species B (2n = 16), and species C (2n = 18). Which of the following is a possible mechanism by which the new species could have arisen from the others?
a. Either autopolyploidy due to a nondisjunction in the formation of gametes of species B or allopolyploidy associated with hybridization between species A and C
b. Allopatric divergence by development of a mechanical reproductive isolating mechanism
c. Autopolyploidy due to a nondisjunction in the formation of gametes of species B
d. Allopolyploidy associated with hybridization between species A and C
e. Change in a key developmental gene that causes the plants to flower at different times
Answer: a. Either autopolyploidy due to a nondisjunction in the formation of gametes of species B or allopolyploidy associated with hybridization between species A and C
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