Which of the following is an example of a primary sex characteristic?
• development of body hair in boys
• development of ovaries in girls and testes in boys
• development of breasts
• development of acne in boy
• development of ovaries in girls and testes in boys
you sure
The development of ovaries in girls and testes in boys is an example of a primary sex characteristic.
The primary sex characteristics refer to the physical traits that are directly related to the reproductive system and are typically present from birth. Out of the options you provided, the development of ovaries in girls and testes in boys is an example of a primary sex characteristic.
To understand this, it's important to consider the process of sexual differentiation during fetal development. In early stages of development, both male and female embryos are anatomically similar. However, around the seventh week of gestation, the presence of the Y chromosome triggers the development of testes in male embryos.
These testes then produce testosterone, a hormone responsible for the development of male reproductive organs, such as the and scrotum. Conversely, in female embryos, the absence of the Y chromosome leads to the development of ovaries, which produce estrogen, the hormone responsible for the development of female reproductive organs, including the uterus and fallopian tubes.
Therefore, the development of ovaries in girls and testes in boys is a prime example of primary sex characteristics because these reproductive organs play a direct role in the production of gametes (eggs and sperm) and in the overall reproductive function of individuals.