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Triple X syndrome is a genetic condition found in females only. About 1 in 1, girls have it. Other symptoms can include problems with spoken language and processing spoken words, coordination problems, and weaker muscles. Most girls with triple X syndrome can grow up healthy, have normal sexual development and fertility, and lead productive lives. Depending on which symptoms a girl has and how severe they are, doctors may recommend various treatments. Girls who have triple X syndrome are born with it.

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The Sex of Offspring Is Determined by Particular Chromosomes | Learn Science at Scitable

The XY sex-determination system is a sex-determination system used to classify many mammals , including humans , some insects Drosophila , some snakes, some fish guppies , and some plants Ginkgo tree. In this system, the sex of an individual is determined by a pair of sex chromosomes. Females typically have two of the same kind of sex chromosome XX , and are called the homogametic sex. Males typically have two different kinds of sex chromosomes XY , and are called the heterogametic sex. In humans, the presence of the Y chromosome is typically responsible for triggering male development; in the absence of the Y chromosome, the fetus will undergo female development. More specifically, it is the SRY gene located on the Y chromosome that is of importance to male differentiation.
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XY sex-determination system

This page has been archived and is no longer updated. By the s, scientists had established methods for staining chromosomes so that they could be easily visualized using a simple light microscope. With this staining method, scientists were able to observe cell division and to identify the steps that occurred during both mitosis and meiosis Figure 1. Arrows indicate the axis along which the cell divides. The first indication that sex chromosomes were distinct from other chromosomes came from experiments conducted by German biologist Hermann Henking in
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Triple X syndrome, also called trisomy X or 47,XXX, is characterized by the presence of an additional X chromosome in each of a female's cells. Although females with this condition may be taller than average, this chromosomal change typically causes no unusual physical features. Most females with triple X syndrome have normal sexual development and are able to conceive children. Triple X syndrome is associated with an increased risk of learning disabilities and delayed development of speech and language skills.
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