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Glossary Sex chromosome

determines an organism's sex and influences other traits

A sex chromosome, also known as an allosome, is a type of chromosome that determines the sex of an organism. In humans, there are two types of sex chromosomes: X and Y. Females typically have two X chromosomes (XX), while males have one X and one Y chromosome (XY). These chromosomes carry genes that not only influence sexual development but also affect other traits, including some related to hair growth and alopecia.

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research Sex-Chromosome-Related Dimorphism in Steroidogenic Enzymes and Androgen Receptor in Response to Testosterone Treatment: An In Vitro Study on Human Primary Skeletal Muscle Cells

December 2023 in “International journal of molecular sciences”

This in vitro study found sex chromosome differences affect steroidogenic enzyme activity and androgen receptor expression in human skeletal muscle cells, showing varied responses to testosterone exposure between 46XY and 46XX cells.

research Sex-limited chromosomes and non-reproductive traits

10 citations , July 2022 in “BMC Biology”

This review discusses how sex-limited chromosomes can affect non-reproductive traits in various sex determination systems and reports no new empirical results.

research The X Factor in Immunity: Sex Differences Shaped by the X Chromosome

January 2026 in “Immunological Reviews”

This review discusses sex differences in immune responses and highlights mechanisms involving sex hormones, X-linked genes, and X-Chromosome Inactivation, but reports no new clinical findings.

research The Who’s, What’s, and “Y”s: Y Sex Chromosome Loss and Methylation for Analysis in Male Aging and Mortality and Forensic Science Applications

November 2024 in “Forensic Sciences”

This review highlights the potential for using the Y chromosome in epigenetic analyses to better understand male-specific aging and disease mechanisms.

research Disorders of Sex Development

4 citations , August 2021 in “Pediatrics in review”

This review explores disorders of sex development, emphasizing the need for a systematic, multidisciplinary approach and the benefits of genetic testing for better diagnosis and gender assignment planning, but it reports no new clinical findings.

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community IVF process on Finasteride and effects of stopping finasteride.

138 upvotes 9 months ago

Concerns about finasteride affecting sperm quality and embryo abnormalities during IVF. The user plans to stop finasteride for 6 months and use minoxidil, microneedling, a red light cap, and saw palmetto shampoo to manage hair loss.

community Female, 30, PCOS diagnosis, MPB Norwood 2. Endo refuses to give anything other than Spironolactone. Feel like I’m at my wit’s end here.

55 upvotes 2 years ago

A 30-year-old female with PCOS and male pattern baldness is frustrated with her endocrinologist's recommendation of only Spironolactone and minoxidil, feeling that dutasteride, finasteride, and progesterone would be more effective. Other users suggest various online sources for treatments, warn against self-medicating due to potential risks, and recommend seeking a specialized endocrinologist or considering additional treatments like Inositol, Berberine, and dermaneedling.

community Why are hormone blockers more socially acceptable than hair systems or balding?

in Chat 105 upvotes 5 months ago

Finasteride is more accepted than hair systems because it is less visible and maintains natural hair. Treatments like minoxidil and finasteride are commonly used for hair loss, but opinions on hair systems vary.

community Why not just take the drugs before hair loss?

in Chat 123 upvotes 6 months ago

Finasteride and dutasteride are discussed as preventative treatments for hair loss, with some advocating for early use and others concerned about side effects, especially before full maturity. Many regret not starting these treatments earlier due to their effectiveness in preventing or slowing hair loss.

community Why do we have head hair in first place if we evolved to start losing it in some cases as soon as puberty hits

140 upvotes 11 months ago

Hair loss is influenced by genetics and sensitivity to hormones like DHT. Treatments like Minoxidil and finasteride are commonly used, and baldness persists as it doesn't affect reproductive success.

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