Question

(b) the physical location of a gene on a chromosome is called
(c) the point of attachment of two chromosomes is called

Explanation:

• For (b), in genetics, the physical location of a gene on a chromosome is defined as a locus.
• For (c), the centromere is the specific point where two sister chromatids (or in some cases, chromosomes in a more general sense) are attached.

Answer:

(b) locus
(c) centromere