Karyotypes Generally Remain Constant Within a Species Because

Multiple Choice

Karyotypes generally remain constant within a species because

A) rearrangements occur frequently.
B) changes in chromosome number occur infrequently.
C) genetic instabilities produced by genomic changes usually are at a selective disadvantage.
D) genetic imbalances are often at a selective advantage.
E) DNA replication has evolved to handle only a specific number of chromosomes.