Question

two molecules of dna are shown here. based on the alleles shown, what are they likely to be? note that for this exercise they are drawn separately, even if they might be sister chromatids. options: sister chromatids; non - sister chromatids or homologous chromosomes; non - sister chromatids only; homologous chromosomes only; non - homologous chromosomes

Explanation:

Sister chromatids are identical copies of a chromosome formed after DNA replication, carrying the same alleles. The two DNA molecules here have the same alleles (A₁, B₁, C₁, D₁), so they match the definition of sister chromatids. Homologous chromosomes have similar but not identical alleles (for different versions of genes), non - homologous have different gene sets, and non - sister chromatids (from homologous chromosomes) have different alleles. So the correct classification is sister chromatids.

Answer:

A. sister chromatids