A long time ago, Jim and I were shopping for trees. We discovered we could order male ash trees — as opposed to female trees. Of course, “male” was what we call the tree’s sex, which is biological. It was not the tree’s gender, which would be role. The tree’s main intended role, by the way, was “shade tree.”
The existence of male, female, and true hermaphrodite trees and plants comes to mind when people are discussing “what is sex?”, “what is gender?”, and “do their meanings differ?”. The correct answer is that they do differ. Sex is biological; gender is a role. Today, I’ll focus on biological sex.
So what is biological sex? Let’s start by asking this question:
When biologists discover a new species that reproduces sexually, how do they decide which of the two sexes is male, which is female, and whether, possibly, individuals are both simultaneously?
The answer is that they examine the gametes an individual produces. In sexually reproducing species, there are two types of gametes. Some species are observed to have one larger, nutrient-rich, usually non-motile gamete (i.e., egg) and one smaller, non-nutritive, mobile gamete (e.g., sperm, pollen). These species, with differently sized gametes, are called “anisogamous.” The individuals whose reproductive organs create the smaller gametes only are called males. The ones that create the larger gametes only are called females. Individuals that create both are biological, or true, hermaphrodites.
It may be worth noting that hermaphrodites may be sequential hermaphrodites, or simultaneous hermaphrodites. When a hermaphrodite is sequential, it is referred to as male during periods when it creates the smaller gametes, and female when it creates the larger, nutritive gametes. The identification of its current state of maleness or femaleness depends on the gametes it is currently producing.
Sex in humans
Humans are an anisogamous, sexually reproducing species. As such, biologically, humans are nearly always either male or female. Most humans are male or female, though disorders of sex development and other conditions do occur. Those whose sexual organs are designed to produce sperm are males; those that produce ova are females.
True hermaphroditism in humans — ovotesticular disorder (DSD) — is extremely rare, occurring in roughly 1 in 80,000–100,000 births. Other disorders exist: Androgen Insensitivity Syndrome (AIS), congenital adrenal hyperplasia (CAH), and Klinefelter syndrome (47, XXY). Sometimes, the XYY chromosomal variation occurs.
It is worth noting: even when disorders, conditions, or syndromes occur, the biological sex of the individual is based on the gametes their body produces. Their biological sex does not depend on their phenotype — the appearance of their body or organs. However, since gonads produce gametes, and testes produce sperm while ovaries produce eggs, those with testes are males, and those with ovaries are females.
With respect to disorders: individuals with XXY (Klinefelter syndrome) have testes, which may produce sperm, though function may be impaired. XYY individuals also have testes and, generally, normal sperm production. In all three cases, the bodies are designed to produce sperm, though that production may be impaired. So all of these individuals are biologically male. Individuals with congenital adrenal hyperplasia (CAH) have a typical complement of gonads—ovaries in genetic females (XX) and testes in genetic males (XY).
The only disorder in which an individual is not specifically male or female is ovotesticular disorder (DSD); these individuals are true hermaphrodites.
Assignment at birth
Let me now discuss the notion of “assignment” at birth. What is really happening during “assignment”? What is intended?
At birth, doctors, midwives, and perhaps even the cab drivers who deliver the baby—because there was insufficient time to get to the hospital—will often inspect the newborn and, based on that inspection, decree, likely with some joy, “It’s a boy,” or “It’s a girl.” Along with that, they may also decree, “Ten fingers! Ten toes!” Perhaps, occasionally, whoever is in attendance will be stumped. The ensuing, “Yikes. I can’t tell!” is likely less joyful, as would be “Wow! Twelve toes!”
What is going on here? Well, what’s happening is that the attendants are doing a physical inspection of the phenotype—the outer physical appearance—and making a guess at the baby’s biological sex based on that phenotype. If the baby has a penis and external testes, they diagnose the sex as “boy,” that is, “male.” If the baby has a vulva and no penis, they diagnose the sex as female. Those diagnosing the biological sex usually do so in good faith, and usually do so correctly. However, misdiagnosis can occur, particularly in cases of disorders of sex development or other atypical phenotypes.
After the diagnosis, whoever fills out the birth certificate will check the “sex” box according to their diagnosis: male or female. Some states permit “undetermined,” “X,” or similar. So, they fill out the box to reflect their guess or diagnosis of the sex based on the child’s appearance.
Even in rare cases where underlying gamete potential cannot be diagnosed unambiguously based on external genitalia, the baby’s biological sex — defined by the gametes its body is designed to produce — remains a distinct attribute.
I don’t wish to stray into “gender” too far; I’d like to discuss that in a later post. But it is true that the diagnosis of the child’s sex is one of the things that can affect how parents relate to the child, and later what roles or behavioral expectations parents or others have for the child. Biologically, the baby’s sex exists independently of how the box is checked. To the extent that “gender” is assigned, it occurs socially, through the parents’ or other people’s response to the diagnosis of biological sex. But this does not change the baby’s sex. The baby’s sex is a biological attribute and is not “assigned” by doctors, parents, or society.
In summary: sex is a biological attribute that can be determined by the gametes an individual’s reproductive system creates. Some disorders or syndromes can affect how an individual looks, but their sex remains determined by the gametes they produce. An individual’s sex is not “assigned” at birth; it exists prior to birth and remains unchanged by the diagnosis doctors or others make at birth.
I invite you to discuss this. You may discuss gender also, but I intend a later post on what gender is. Briefly, gender is not biological; it is a social role.