Question

Which of the following statements applies to homologous non-sister chromatids?

- They are genetically identical.
- They contain the same genes in the same order but may have different alleles of some genes.
- They segregate from each other at anaphase of mitosis.
- Their centromeres are attached during meiosis II.
- More than one statement applies to homologous chromatids

Answer 1

Homologous non-sister chromatids possess the same genes in the same order but have different alleles. They recombine during meiosis, which results in genetic shuffling and, hence, they are not genetically identical. The correct option is b.

Step-by-step explanation:

Homologous non-sister chromatids contain the same genes in the same order but may have different alleles of some genes. This occurs because homologous chromosomes come from different parents and undergo recombination, or crossing over, during meiosis. Thus, they are not genetically identical. Furthermore, homologous chromosomes

• Are paired during prophase I of meiosis,
• Separate from each other during anaphase I of meiosis,
• Do not normally associate with their centromeres during meiosis II as sister chromatids do.

Therefore, the correct statement that applies to homologous non-sister chromatids is that they contain the same genes in the same order but may have different alleles of some genes. More than one statement can apply to homologous chromatids considering the various stages of meiosis.