In Drosophila melanogaster,polytene chromosomes are produced when
A)a chromosome breaks and rejoins with another section of the same chromosome.
B)a cell divides several times before the chromosomes are duplicated.
C)chromosomes are duplicated repeatedly without a corresponding nuclear division.
D)a segment of a chromosome is duplicated during an unequal crossing-over event.
E)characteristic banding patterns form on the chromosomes.

Question

Quizplus · Accepted Answer

Polytene chromosomes are formed by repeated rounds of chromosome replication without cell division, resulting in many copies of each chromosome aligned side by side, forming characteristic banding patterns. This process is known as endoreplication.

In Drosophila Melanogaster,polytene Chromosomes Are Produced When