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How might x inactivation cause patchy hairiness on women who have congenital generalized hypertrichosis even though the disease causing allele is dominant?
Wiki User
∙ 11y ago
Since one X chromosome in each cell is randomly inactivated at some point during development, a woman heterozygous for hypertrichosis would have varying regions of patchy hair if the alleles responsible for the trait were located on the X chromosome.
Variation would look similar to the varied tortoise shell coat color pattern on female cats, where the presence of yellow and black (red and gold/blue and cream) is controlled by X chromosome inactivation.
Wiki User
∙ 11y ago
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Why do humans have sparse body hair?
Hairiness has to do with genetics; basically, the hairier someone is, the more likely he (or she!) is descended from people who lived in an area with a lot of bugs, especially mosquitoes. Also, Caucasians tend to be hairier than people of other races, Asians and Native Americans tend to be least hairy.
Do men become more hairy as they age?
Short answer, yes. Most male secondary sexual characteristics are completely developed by the completion of puberty, which can be anywhere from about age 15-25 in most men. However, a few things continue to grow and change after puberty stops. The ears and nose both continue to grow in size until you die, however very slowly. A few skeletal structural changes may occur in the mid, to late 20's, like a broadening of shoulders, or a squaring of the jaw. Most men get the adult hairline at about 15-25, which is a slight recession, which most men get than stops, and doesn't lead to balding (not the same cause as male pattern baldness), lastly a man will keep growing thicker, darker, coarser, and more body hair as he ages, perhaps well into his 30s and beyond. The hair grows in patterns. Around age 15 or so you may notice a few chest hairs, by 17 you'll probably have a treasure trail, hair around your nipples, and a small amount of hair in the middle of you chest. Your legs and arms will also be hairier, as will your buttocks, perineum, pubic area, and face. Over the next few years your chest of stomach hair spreads outwardly. By 19, you'll have a bat shaped chest hair pattern, that will be quite light in colour, and your stomach hair will have spread from your treasure trail toward your obliques. At this age back hair growth will start. By 21, your entire chest might be covered in hair, and it will thicken and darken in some men by age 25, and from 25 on, your back hair will thicken and darken, and cover more area. This is why most men over 35 are a lot hairier than men in their 20's and early 30s. However, some men will have a body hair peak at around age 17 or 18 in which their body hair will be darkest and thickest, and then start to lighten and fall out, leaving only peach fuzz. This is rare however. But I have noticed it in a few of my friends. They were hairier in around senior year in high school, and have since reverted back to being less hairy. Also, those young men who get very hairy at age 17 or 18 tend to go bald on their heads by the time that they are 25, so its not always a good thing to be so hairy when only 18 or younger. My experience is hair does not stop growing on your chest or shoulders even by age 66, the age I am, the hair on my never trimmed chest or shoulders is now almost 6" long and still growing slowly, I am I bit thinner on my head, although I still have quite a lot of hair on top. UPDATED 24th-04-2016 The degree of hairiness is decided by the different sensitivity of skin follicles of individuals to testosterone, this is genetics..........................For example, with same amount of testosterone, the guy will be more hairy than others if his skin follicles are more sensitive to testosterone...................................... Women's skin follicles are most sensitive to testosterone, so had women have same amount of testosterone in their body as man do, they would have become super super hairy! Fortunately their testosterone level is minimal.................................................. Now when it comes to explain why men will grow more body hair as they age, it is very simple.................................................. When men grow older, the skin follicles are not as functional as before, the follicles are more sensitive to testosterone despite testosterone level has dropped due to age.
What is definition of yarn hairiness index?
Hairiness is measured in two different methods.Uster Hairiness IndexZweigle Hairiness Index1. Uster Hairiness Index: - This is the common method followed in India. The hairiness index H corresponds to the total length of protruding fibres within the measurement field of 1cm length of the yarn.2. Zweigle Hairiness Index: - This zweigle hairiness measurement gives the number of protruding fibers more than 3 mm in length in a measurement length of one meter of the yarn.From the above we can infer that Uster hairiness index give the total length of hairs whereas zweigle hairiness testers give the absolute number of fibers. Though the later measurement is more accurate, most of the Indian spinners are still following Uster hairiness index only.
What is the medical term meaning abnormal hairness?
"Hirsutism" is the medical term meaning abnormal hairiness, usually referring to excess hair growth in women in a male pattern distribution, such as on the face, chest, and back. Hirsutism can be caused by hormonal imbalances, genetic factors, or certain medical conditions.
72F of yarn count?
The first number of a yarn count (D) generally indicates the fineness of the yarn (how thick it is). The second number (F) indicates the fluffiness or hairiness of the yarn. The last number indicates the number of plies in the yarn. Example: 75D/72F/2 is a 75 denier (75 g/9000m), 2-ply yarn with a hairiness or fluff index of 72. The fluff index becomes important in weaving where it can change the optical effects of the woven fabric. There are several different systems for measuring yarn hairiness. The F-index method appears to be from a patented Japanese method of measurement.
What is yarn hairiness?
Yarn hairiness denotes the amount of hairs (fibres) protruding above the surface of the textile yarn. Especially, in case of staple spun yarns, since multiple fibres are bound in a single yarn, fibres will tend to protrude outside the body of the yarn even though proper twisting is done for that yarn. Usually Hairiness is denoted in terms of the parameter "Hi", which means "Hairiness Index". It represents the total length of hairs (in cm) measured over the yarn length of 1 cm. Another way of representing Hairiness is "Hair Count". It represents the number of hairs counted for a given length of yarn. It varies from 3mm to 10mm. Longer Hairs are problematic compared to shorter hairs. Shorter hairs are essential for yarns to provide comfort for fabrics. In new generation testers, a new parameter called "Hair Severity" is available which represents the severity of longer hairs. This number will indicate the influence of hairs in further processing like weaving and knitting. Latest generation yarn testing equipment by PREMIER offers all these parameters.
Does a hairy body indicate high testosterone?
The presence of testosterone encourages the growth of body hair.
Are all greek men hairy?
No, not all Greek men are hairy. Hairiness can vary among individuals based on genetics, hormones, and personal grooming preferences.
What is abnormal hairiness called?
Personally, I've known several women who have more hair than they want. I don't think it is abnormal at all. It's actually quite common. There is a condition known as Hypertrichosis. This condition causes an abnormal development of hair on areas of the body that normally grow only light, superfluous hair. The best way to eliminate this hair is by laser. However, for laser treatment to be effective, the hair needs to have darker pigment than the skin. If your hair is not darker than your skin, electrolysis will work. In some cases this can be secondary to an endocrine disorder. Which should be discussed with your medical doctor. We are all unique. I hope this information helped.
Are German girls hairy?
It is not appropriate to generalize any group of people based on physical traits. Hairiness can vary among individuals regardless of nationality or ethnicity.
What movie is about a hairy woman in a circus people think shes a werewolf but not get hunted in the woods a wolf not a werewolf gets shot and dies she is found cured from neck down long hairiness?
The movie is Blood Moon/ Wolf Girl (2001)
What is siro yarn?
The Siro process makes it possible to produce a directly weavable two ply yarn, directly at the ring spinning machine, so eliminating the usual twisting process. From this you get yarn strength, a smooth yarn, minimal hairiness and round yarn cross section
What is 'lomasa' when translated from Sanskrit to French?
Duveteux and poilu are French equivalents of the Sanskrit word lomasa. The respective pronunciations of the masculine singular adjectives -- which references a Vishnu-devoted sage in Hinduism and whose choice depends upon downiness of the former and the hairiness of the latter -- will be "dyoov-tuh" and "pwa-lyoo" in French.
Which hormone causes abnormal hairness and masculinization?
The cause of abnormal hairiness andmasculinization is not caused by the overproduction of testosterone as most believe, but is actually caused by the Norris Gene. The Norris Gene, discovered and invented by Chuck Norris is a very rare benefit only given to those who have managed to outfight Bruce Lee.
