Flea Pupa. The flea larvae spin cocoons around themselves in which they move to the last phase of the flea life cycle and become adult fleas. The larvae can remain in the cocoon anywhere from one week to one year. Temperature is one factor that determines how long it will take for the adult flea to emerge from the cocoon.
Nondisjunction causes chromosomal disorders because sometimes an error in meiosis occurs when homologous chromosomes fail to separate which results in the organism receiving t â¦ he wrong number of chromosomes thus having a chromosomal disorder. 14 people found this useful.ondisjunction causes chromosomal disorders because sometimes an error in meiosis occurs when homologous chromosomes fail to separate which results in the organism receiving t â¦ he wrong number of chromosomes thus having a chromosomal disorder. 14 people found this useful.
1 Prader-Willi syndrome, on the other hand, is caused by the absence or non-expression of a group of genes on chromosome 15. 2  A specific form of blood cancer (chronic myeloid leukemia, CML) may be caused by a chromosomal translocation, in which portions of two chromosomes (chromosomes 9 and 22) are exchanged.