Definition of the chromosomal compositions of one species:
A = a1 + a2 + a3 . . . an
where a1 , a2 , etc. represent individual chromosomes and n is the haploid chromosome number. The chromosomal composition of the second species will be:
B = b1 + b2 + b3 . . . bn
Autopolyploid - an individual that has an additional set of chromosomes that are identical to the parental species
autotriploid = AAA
autotetraploid = AAAA
Allopolyploid - an individual that has an additional set of chromosomes derived from another species; these typically occur after chromosomal doubling; chromosomal composition = AABB
