Which chromosome pattern represents a male?

Which chromosome pattern represents a male?

• A. XY
• B. XX
• C. YY
• D. YX

Answer: (A)

Sex is determined by the sex chromosomes. In humans, males have one X and one Y chromosome, so the pattern XY indicates male development because the Y carries the SRY gene that triggers male characteristics. Patterns with two X chromosomes produce typical female development, and a two-Y combination isn’t a normal human pattern. The arrangement YX is just another way people might write the same content as XY, but XY is the standard way to represent a male.

Sex is determined by the sex chromosomes. In humans, males have one X and one Y chromosome, so the pattern XY indicates male development because the Y carries the SRY gene that triggers male characteristics. Patterns with two X chromosomes produce typical female development, and a two-Y combination isn’t a normal human pattern. The arrangement YX is just another way people might write the same content as XY, but XY is the standard way to represent a male.