Which of the following best explains why a robertsonian carrier may have no health problems due to his or her chromosome rearrangement?

a. genes on the lost p arms can be found elsewhere in the genome.
b. there are no genes found on any of the p arms of acrocentric chromosomes.
c. all acrocentric p arms contain the same base sequence.
d. the long q arm chromosome copies the genetic information from the p arms before they are lost.

The correct answer is option A.

Explanation:

Robertsonian translocation occurs of 2 acrocentric chromosomes with no problems for the person carrying it in balanced form. In an unbalanced form, it produces chromosome imbalance leads to mental disorder or malformations.

In this translocation p arm or long arm join with other chromosome's long arm, carrier is normal due to the presence of 2 copies of all chromosome arms so there will be all the copies of essential genes.

Thus, the correct answer is - option A.