posted on Jul, 11 2012 @ 05:44 AM
We all have 46 chromosomes plus either two copies of the X chromosome, or one X plus one Y chromosome.
A karyotype (Greek karyon = kernel, seed or nucleus) is the number and appearance of chromosomes in the nucleus of a eukaryotic cell. The term is
also used for the complete set of chromosomes in a species, or an individual organism. Karyotypes describe the number of chromosomes, and
what they look like under a light microscope. Attention is paid to their length, the position of the centromeres, banding pattern, any differences
between the sex chromosomes, and any other physical characteristics. The preparation and study of karyotypes is part of cytogenetics. Karyogram of
human male using Giemsa staining The study of whole sets of chromosomes is sometimes known as karyology. The chromosomes are depicted (by rearranging
a microphotograph) in a standard format known as a karyogram or idiogram: in pairs, ordered by size and position of centromere for chromosomes of the
same size. The basic number of chromosomes in the somatic cells of an individual or a species is called the somatic number and is designated 2n. Thus,
in humans 2n = 46. In the germ-line (the sex cells) the chromosome number is n (humans: n = 23).p28 So, in normal diploid organisms, autosomal
chromosomes are present in two copies. There may, or may not, be sex chromosomes. Polyploid cells have multiple copies of chromosomes and haploid
cells have single copies. The study of karyotypes is important for cell biology and genetics, and the results may be used in evolutionary biology and
medicine. Karyotypes can be used for many purposes; such as to study chromosomal aberrations, cellular function, taxonomic relationships, and to
gather information about past evolutionary events.
In the garden of Eden lived Adam and Eve.That was the paradise-garden on Earth.
They could eat any fruit they want to from the trees in that garden except the forbiden fruit from the tree of knowledge.
But the snake tempt them.
he Eden story, which takes up chapters 2 to 4 of the Book of Genesis, tells how the Abrahamic God creates the first man and puts him in a
paradise-garden in Eden. Before making the first woman, God tells the man that he may eat the fruit of any of the trees in the garden except that of
the tree of knowledge of good and evil. God then forms the first woman (named Eve) and Genesis 2 ends with a note that the man and woman "were naked
and felt no shame". A talking snake subsequently tempts the woman to eat the fruit with the promise of knowledge. The woman and the man both eat,
become aware of their nakedness and make coverings for themselves. God, aware that the first humans now have knowledge, banishes them from the garden
lest they eat from the Tree of Life and live forever.
And only then Humans started to breed.
From all the living creatures on Earth Humans are the only one that are aware of their nakedness.
From all the creatures on Earth Humans are the only ones aware of the sexual act.
That is the Forbiden Apple.
That is The 23rd Cromosome.
The 23rd chromosome is the sex chromosome. It is either an X or Y (strictly male) chromosome. When the sperm and egg cells fuse, they combine into
46 chromosomes with either two X chromosomes or an XY pairing. If it is 2 X chromosomes, the zygote is a female. If it an XY pairing, the zygote is a
male. Read more: wiki.answers.com...
What if your fetus is missing the 23rd Chromosome? I know from genetics that a missing 23rd chromosome results in just an X chromosome, which is
better known as Turner's syndrome...but this only results in girls. Does anyone know what the name is for a male with a missing 23rd chromosome? Or if
it's even possible to have a male with only 1 X chromosome. Thanks.
All normal males have only one X chromosome, by definition. ;-) They have one X and one Y. (Normal females are XX.)
A fetus that was YO (as Turner's females are XO, meaning that there is no second chromosome) would not be viable. There are a lot of important genes
on that X chromosome.
It is, however, possible to have a male with two X chromosomes (XXY). They have a syndrome known as Kleinfelter's. It is also possible to have XYY
(two Y chromosomes). These males tend to be taller than average but are otherwise normal.
Fourth year medical student.
Turner syndrome or Ullrich-Turner syndrome (also known as "Gonadal dysgenesis":550), 45 XO, encompasses several conditions in human females, of
which monosomy X (absence of an entire sex chromosome, the Barr body) is most common.
It is a chromosomal abnormality in which all or part of one of the sex chromosomes is absent (unaffected humans have 46 chromosomes, of which two are
sex chromosomes). Normal females have two X chromosomes, but in Turner syndrome, one of those sex chromosomes is missing or has other abnormalities
. In some cases, the chromosome is missing in some cells but not others, a condition referred to as mosaicism or "Turner mosaicism". Occurring in 1
in 2000 – 1 in 5000 phenotypic females, the syndrome manifests itself in a number of ways. There are characteristic physical abnormalities,
such as short stature, swelling, broad chest, low hairline, low-set ears, and webbed necks. Girls with Turner syndrome typically experience gonadal
dysfunction (non-working ovaries), which results in amenorrhea (absence of menstrual cycle) and sterility.
Concurrent health concerns are also frequently present, including congenital heart disease, hypothyroidism (reduced hormone secretion by the thyroid),
diabetes, vision problems, hearing concerns, and many autoimmune diseases. Finally, a specific pattern of cognitive deficits is often observed,
with particular difficulties in visuospatial, mathematical, and memory areas. Turner's syndrome is named after Henry H. Turner.
This is the Proof that Evolution is Wrong.
edit on 11-7-2012 by diamondoftheworld because: n