Trisomy is a mutation that results in a cell having an extraA) nitrogen base. B) codon. C) chromosome. D) gene.
If you break down the word trisomy, tri refers to three and somy refers to chromosomes. Since chromsomes occur in pairs, trisomy indicates an additional chromosome at a certain position on a karyotype. Therefore, the answer is chromosome. A trisomy can result during gamete formation. If non-disjunction occurs during meiotic division, then, a gamete may have one more or one less chromosome in it. If the gamete with an extra chromosome goes on to form a zygote, the zygote will contain an additional chromosome at that location. This is a form of aneuploidy which is an abnormal set of chromosomes.