Question

If the cell whose nuclear material is shown above continues toward completion of mitosis, which of the following events would occur next? A. cell membrane synthesis 0 B. spindle fiber formation 0 c. nuclear envelope breakdown D. separation of the sister chromatids E. formation of a cleavage furrow

Answer 1

The correct option is - (D) separation of sister chromatids- is the events would occur next according to the given picture.

Because, the given picture shows i.e. metaphase, the chromosomes are aligned at equator of the spindle, midway between the spindle pole. According to the principle stages of mitosis, after metaphase the sister chromatids synchronously separate to form two daughter chromosome and each is pulled slowly towards the spindle pole its faces. The kinetochore microtubules get shorter, the spindle poles also move apart, both processes contribute to chromosome segregation; this stage is called Anaphase.  

spindle pole moving towards Daughter Chromosomes Shortening kinetochore microtubule Figi - Anaphase

Option (A) cell membrane synthesis- is not correct because according to given picture is metaaphase then anaphase,telophase and at last cytokinesis where cell plate formed in plants and cleavage formed in animals for the formation of two seperate cell wall formation for two new daughter cell. After that cell membrane synthesis start in each cell.

Option (B) spindle fibre formation- is not correct because spindle fibre formation starts at the end of the prophase i.e. prometaphase. In this stage chromosomes can attach to spindle microtubules via kinetochores and under active movement.

Option (C) Nuclear envelop breakdown- is not correct because at late prophase the nuclear envelop breakdown starts and at prometaphase stage it compleated.  

Option (E) Formation of a cleavage furrow- is not correct because at late telophase stage the middle of the cytoplasm become cleaved by a contractile ring of actin and myocin filaments which pinches the cell in two to create two daughters.