For a species with a diploid number of 18 chromosomes, indicate how many chromosomes will be present in the somatic cell nuclei of individuals that are: a. haploid b. triploid c. tetraploid d. trisomic e. monosomic

a. haploid: 9

b. triploid: 27

c. tetraploid: 36  

d. trisomic: 19

e. monosomic: 17

Explanation:

A haploid cell contains a single set of chromosomes (1n), which is the same number of chromosomes found in eggs and sperm cells. Moreover, triploidy is a genetic condition in which there are three sets of chromosomes (3n) in single cells, while a tetraploid cell contains four complete sets of chromosomes (4n). Finally, a trisomy is an abnormal chromosomal condition characterized by the presence of an extra chromosome (i.e. three instead of two), while monosomy is characterized by the presence of only one chromosome (i.e., one instead of two).

telophase and anaphase