If two genes are linked, what does that mean about their physical loca-
tion on chromosomes?

If two genes are linked, what does that mean about their physical location on chromosomes?

It means the genes are located close to each other on the chromosomes

Explanation:

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides