What would be the number of chromosomes in the ovum (fertilized by a normal sperm) that resulted in the appearance of Klinefelter's syndrome in the offspring?

The chromosomal condition $2n-1$ is an example of what?

The affected individuals are short-statured in disorders like:

Feminized males have . . . . . . chromosomes.

Mongolism syndrome is caused by

$A$ cross between a white-eyed female and a red-eyed male Drosophila gives red-eyed females and white-eyed males. Occasionally,the cross gives white-eyed females and red-eyed males. This is due to: