At birth, male and female infants are distinguished by secondary sex characteristics, the genitalia used in the reproductive process.
a) True
b) False
The Correct Answer and Explanation is:
The correct answer is b) False.
At birth, male and female infants are distinguished by primary sex characteristics, not secondary sex characteristics. Primary sex characteristics refer to the physical and biological attributes that are directly involved in reproduction. In the case of male infants, the primary sex characteristics include the presence of male genitalia, such as the penis and scrotum, which are present at birth. For female infants, the primary sex characteristics include the presence of female genitalia, such as the vulva and internal reproductive structures like the ovaries.
Secondary sex characteristics, on the other hand, develop later during puberty and are not present at birth. These characteristics are influenced by hormonal changes that occur during adolescence. In males, secondary sex characteristics may include the development of facial and body hair, a deeper voice, and increased muscle mass. In females, secondary sex characteristics include breast development, the distribution of body fat, and the onset of menstruation.
At birth, the differentiation of male and female infants is primarily based on the observation of their external genitalia, which are defined by their chromosomal and gonadal characteristics. Males typically have XY chromosomes, leading to the development of male genitalia, while females typically have XX chromosomes, resulting in female genitalia. This biological differentiation is crucial for identifying the sex of the infant immediately after birth.
In summary, while male and female infants are distinguished at birth, it is through primary sex characteristics related to the reproductive organs, not secondary sex characteristics, which emerge later in life. Thus, the statement that male and female infants are distinguished by secondary sex characteristics at birth is false.