IGCSE Biology – Human Reproduction Practice Test

The genotype for males in humans is XY. This designation is based on the presence of two different sex chromosomes: one X chromosome and one Y chromosome. The X chromosome carries genes that are important for various physiological functions, while the Y chromosome carries genes crucial for male sex determination and the development of male reproductive structures. Males inherit an X chromosome from their mother and a Y chromosome from their father during fertilization, leading to the XY combination. This arrangement triggers the development of male characteristics, such as the formation of testes, which produce sperm and male hormones. The other options do not represent the typical male genotype. The XX combination is characteristic of females, while YY and XYY do not typically represent the standard genotypic make-up for males in the human species. Understanding the XY genotype helps in comprehending how sex-linked traits and genetic inheritance work in humans.