What gender would a child with one "X" chromosome and one "Y" chromosome be?

A child with one "X" chromosome and one "Y" chromosome would be classified as male. In humans, biological sex is determined by the combination of sex chromosomes an individual possesses. Females typically have two X chromosomes (XX), whereas males have one X and one Y chromosome (XY). The presence of the Y chromosome is what triggers the development of male physical characteristics. Thus, having an X and Y chromosome results in the biological male phenotype, making male the correct answer in this context.