Question

16 in which of the following organisms does an x chromosome not get inactivated? check all that apply placental mammals drosophila c elegans marsupials

Explanation:

In placental mammals, one of the two X - chromosomes in females is inactivated (X - inactivation or Lyonization). In marsupials, the paternal X - chromosome is always inactivated. In Drosophila, dosage compensation occurs by hyper - activation of the single X - chromosome in males, not by X - inactivation. In C. elegans, dosage compensation is achieved by reducing the expression of genes on both X - chromosomes in hermaphrodites, not by X - inactivation.

Answer:

B. Drosophila, C. C elegans