Q.What are holandric genes?

Step 1. Define the term: genes present in the differential (non-homologous) region of the Y chromosome — the part with no corresponding allele on the X chromosome — are called Y-linked or holandric genes.

Step 2. State the inheritance rule: because a Y chromosome is inherited only by sons, and directly from their father, holandric genes pass in an unbroken father-to-son line; a daughter inherits only her father's X chromosome and so is never exposed to his Y-linked alleles, meaning she can neither show nor carry a holandric trait. …

Define holandric genes by their Y-chromosome location and state the resulting father-to-son-only transm …

• Confusing holandric (Y-linked) genes with ordinary X-linked genes, whi …