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Which picture illustrates the anaphase stage of mitosis?

Illustration A shows a rounded shape with yellow asterisks at top and bottom. Curved lines connect the asterisks. In the middle are a series of two blue bent lines, two red v-shaped lines, 2 red u-shaped lined and two blue curved lines. Illustration B shows two curved shapes connected by a center line. A yellow asterisk is located at the point furthest from the center line in each half. Between the center line and the asterisk is a swirled group of red and blue lines. Illustration C shows a rounded shape with yellow asterisks at top and bottom. Curved lines connect the asterisks. Across the center are a long blue ex, two short red exes, and a long blue ex. Illustration D shows a rounded shape with two yellow asterisks at opposite ends near the top and swirled red and blue lines below these.

Question 4 options:

Picture A, where spindle fibers start to pull away from the center of the cell.

Picture B, where nuclear membranes form around each set of chromosomes resulting in two nuclei.

Picture C, where each pair of sister chromatids attaches to a spindle fiber by its centromere.

Picture D, where chromosomes coil up, nuclear membrane breaks down, and spindle fiber system forms.

1 answer

To identify which illustration represents the anaphase stage of mitosis, we need to understand the characteristics of this phase. During anaphase, the sister chromatids are pulled apart toward opposite poles of the cell by the spindle fibers.

Analyzing the illustrations:

  • Picture A describes spindle fibers pulling away from the center of the cell, suggesting that separation is occurring, which aligns with anaphase.

  • Picture B describes the formation of nuclear membranes around each set of chromosomes, indicating telophase, not anaphase.

  • Picture C mentions that sister chromatids attach to a spindle fiber by their centromere, which is a characteristic of metaphase, where chromosomes line up at the cell's equatorial plane.

  • Picture D describes chromosomes coiling up, nuclear membrane breakdown, and spindle fiber formation, typical of prophase, not anaphase.

Based on this analysis, Picture A, with its description of spindle fibers starting to pull away from the center of the cell, best illustrates the anaphase stage of mitosis.