The haploid chromosome number of a cell is 32.How many chromosomes will a trisomic individual have?
A) 31
B) 32
C) 63
D) 65
E) 96

Question

Quizplus · Accepted Answer

The term "trisomic" means that the individual has three copies of a particular chromosome instead of the usual two. If the haploid chromosome number of a cell is 32, it means that a diploid cell (i.e. one with two sets of chromosomes) would have 64 chromosomes. Therefore, a trisomic individual with an extra copy of one of these chromosomes would have a total of 65 chromosomes (64+1). Therefore, the best choice is D.

The Haploid Chromosome Number of a Cell Is 32