At anaphase of meiosis, some chromosome lag behind. They are called laggards. This is due to

• A. Inversion of chromosomes
• B. Acentric chromosome
• C. Dicentric chromosome
• D. Duplication of genes

During anaphase of meiosis, the chromosomes are pulled apart to opposite poles of the cell. However, sometimes certain chromosomes do not move as efficiently, leading to some being left behind, known as laggards. This phenomenon is primarily associated with:

Acentric Chromosome

Acentric chromosomes lack a centromere, which is essential for proper segregation during cell division. Without a centromere, these chromosomes cannot attach to the spindle fibers effectively, causing them to lag behind during anaphase.

Other Options Explained

• Inversion of Chromosomes: This refers to a chromosome segment being reversed. While it can affect gene expression, it does not directly cause lagging during anaphase.
• Dicentric Chromosome: These have two centromeres, which can lead to complications during separation, but they typically do not lag behind.
• Duplication of Genes: This involves extra copies of genes but does not directly relate to the mechanics of chromosome movement during meiosis.

In summary, the correct answer is B. Acentric chromosome, as it is the primary reason for the lagging of chromosomes during anaphase in meiosis.