Question

Human embryo have all the genetic instructions it needed to become a male or female. The male foetus have a master gene which acts as a biological switch, turning other genes on and off. Loss of this gene results in female which remain sexually immature. This master gene is located on

• A. Homologous part of X chromosome
• B. Non-homologous part of X chromosome
• C. All the autosomes
• D. Y chromosome

Answer 1

The correct option is D Y chromosome

The Y-chromosome carries SRY gene which encodes TDF (Testis Determining Factor). The TDF serves as a transcription factor that binds to specific DNA sequence to start the process to develop the embryo into a male child. Loss of this gene hinders the development of testes and the embryo develop female gonads and remain sexually immature.

So, the correct answer is option D.