Sexual diversity is result of sex.
...' Not content with one pair of sex chromosomes, the platypus (Ornithorhynchus anatinus) has five. This is the largest number found in mammals so far, and also hints that the sex determination systems of birds and mammals may be linked.... 'The platypus is native to Australia, and belongs to a primitive group of mammals called the monotremes, along with only two other surviving species: the long-beaked and short-beaked echidnas.
Monotremes were the first group to branch off after mammals evolved 210 million years ago. Their egg-laying shares a common origin with birds and reptiles, although the bill is thought to have evolved independently. '..
https://www.nature.com/news/2004/041025/full/news041025-1.html#:~:text=News-,Duck%2Dbilled%20platypus%20boasts%20ten%20sex%20chromosomes,evolutionary%20origin%20of%20sex%20determination.&text=Everyone%20knows%20that%20the%20duck,way%20its%20genes%20determine%20sex.
...' All of these mechanisms working together result in an amazing amount of potential variation. Each human couple, for example, has the potential to produce more than 64 trillion genetically unique children. No wonder we are all different!
See Sources of Variation at http://learn.genetics.utah.edu/content/variation/sources/ for additional information. '..
https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Introductory_Biology_(CK-12)/02%3A_Cell_Biology/2.39%3A_Genetic_Variation
..' Any variation from these typical numbers is referred to scientifically as an “aneuploidy.” If there is one additional X or Y, it is known as a “trisomy” (“tri” denoting the number 3). Genetic conditions that reflect a trisomy include:
- 47,XXY (Klinefelter syndrome)
- 47,XXX (Trisomy X)
- 47,XYY
Trisomies are the most common X and Y aneuploid conditions. Less common are “tetrasomies,” which denote the presence of four sex chromosomes:
- 48,XXYY
- 48,XXXY
- 48,XXXX
Still rarer are the “pentasomies,” indicating five sex chromosomes:
- 49,XXXXY
- 49,XXXXX
Typically, 48- and 49-chromosome variations produce more pronounced symptoms than trisomies, although this is not always the case.
At the other end of the spectrum lie the “monosomies,” meaning a person born with only one sex chromosome. The only survivable monosomy SCA is 45,X. This is an individual with only one X chromosome, a condition known as “Turner syndrome.”
A fetus with only one Y chromosome and no X chromosome is not viable and cannot survive. AXYS does not include Turner syndrome in its mission. Turner syndrome advocacy and support can be found at www.turnersyndrome.org.
About 20 percent of persons with sex chromosome aneuploidies exhibit “mosaicism,” meaning they have two or more cell lines with different genetic signatures. Examples include 46,XY/47,XXY, and 45,X/47,XXX.
Sex chromosome aneuploidy is not inherited. The extra chromosome occurs in cell division when the egg or sperm is formed, or occasionally during cell division after fertilization. An extra X can be contributed by either the mother or father. Only the father can contribute an extra Y chromosome. '..
https://genetic.org/variations/
( ^ v ^ ) Hi! As always, a reminder that, humans can exist with only one X chromosome, however, no human exists with only one smaller { less complex } y chromosome.