The $TDF$ gene is a.....

The human embryo contains all the genetic instructions necessary to become either male or female. The male embryo contains a master regulatory gene that acts as a biological switch,turning other genes on and off. The absence of this gene results in a female,which remains sexually immature. This master regulatory gene is located on the .....

In the drones of honeybee,there is no reduction in chromosome number during spermatogenesis. This indicates that

Honeybees produce their young ones only by sexual reproduction. Inspite of this,in a colony of bees we find both haploid and diploid individuals. Name the haploid and diploid individuals in the colony and analyse the reasons behind their formation.

Holandric genes are

Which of the following patterns of inheritance is exhibited only by males?