Question

why do some cells lose a nucleus at maturity, though it is a vital component of a cell?

Answer 1

ExampleMammalian erythrocytes are unique among the vertebrates as they are non- nucleated cells in their mature form. These cells have nuclei during early phases of erythropoiesis but extrude them during development as they mature in order to provide more space for haemoglobin. In mammals erythrocytes also lose all other internal membrane structures such as their mitochondria, Golgi apparatus and endoplasmic reticulum.