Question

multiple choice question
what are sister chromatids?

identical structures formed when each homologous chromosome is copied
pairs of chromosomes that include one maternal and one paternal chromosome
the arms of a single chromosome
compact dna in two daughter cells

Explanation:

To determine the correct definition of sister chromatids, we analyze each option:

• Option 1: Sister chromatids are formed when a chromosome (including homologous chromosomes during certain stages) is replicated, resulting in two identical structures connected at the centromere. This matches the definition of sister chromatids.
• Option 2: This describes homologous chromosome pairs (one maternal, one paternal), not sister chromatids.
• Option 3: The arms of a single chromosome are just parts of a chromosome, not sister chromatids.
• Option 4: Compact DNA in daughter cells refers to chromosomes after cell division, not the structure of sister chromatids during replication.

Answer:

A. Identical structures formed when each homologous chromosome is copied