At conception, your mother contributed a gene that encoded for the sickle hemoglobin (hemoglobin S), while your father contributed the same gene that encoded for normal hemoglobin (hemoglobin A). Which of the following denotes the DNA structures which carry these variants?

Homologs and homologous chromosomes.


Chromatids.


Homologs, chromatids, and homologous chromosomes


Analogs and homologous chromosomes.