Which of the following organism does not show 'XO' condition chromosomes?

Drosophila

The correct answer is Option (3) → Drosophila

Sex determination is the method by which the sex of an individual is decided. In Drosophila the males have one X and one Y chromosome, whereas females have a pair of X-chromosomes besides autosomes. In birds, female birds have been designated with two different sex chromosomes known as Z and W chromosomes. In these organisms, females possess one Z chromosome and one W chromosome, while males have a pair of Z chromosomes in addition to the autosomes.

In the majority of insects, the XO type of sex determination is seen. In a large number of insects, the mechanism of sex determination is of the XO type. All eggs bear an additional X-chromosome. Some of the sperms bear the X-chromosome whereas some do not.

Grasshopper is an example of XO type of sex determination in which the males have only one X-chromosome besides the autosomes, whereas females have a pair of X-chromosomes.

Turner’s Syndrome : Such a disorder is caused due to the absence of one of the X chromosomes, i.e., 45 with XO, Such females are sterile as ovaries are rudimentary besides other features including lack of other secondary sexual characters.