<prompt> Normal testicular development requires which of the following chromosomesXYXXY chromosomeX chromosome  <response>: The Y chromosome is one of two sex-determining chromosomes allosomes in mammals, including humans the other is the X chromosome. In mammals, the Y-chromosome contains the gene SRY, which triggers testicle development if present. The human Y chromosome is composed of about 50 million base pairs. DNA in the Y chromosome is passed from father to son, and Y-DNA analysis may thus be used in genealogical research.Ref: Ganong;s review of medical physiology; 24th edition; page no:-419 