What is the genotype of Klinefelter syndrome?
Klinefelter syndrome, in which males have an extra X chromosome, leading to a genotype of XXY . (In rarer cases, Klinefelter syndrome can involve several extra Xs, leading to an XXXY or XXXXY genotype.) Affected men may be infertile or develop less dense body and facial hair than other men. Klinefelter syndrome is thought to affect out of every to male newborns.
What is the orange patch made of?
The orange patch is made up of cells in which the X with the orange allele () is active, while the X with the black allele () is compacted into a Barr body.
What is the name of the process of X-inactivation?
The process of X-inactivation was discovered by the British geneticist Mary F. Lyon and is sometimes called lyonization in her honor.
What is the tortoiseshell pattern made of?
The result of is a tortoiseshell coat pattern, made up of alternating patches of black and tan fur. The black patches come from groups of cells in which the X with the black allele is active, while the tan patches come from cells in which the X with the tan allele is active.
What is the color of a tortoiseshell cat?
Image of a tortoiseshell cat, illustrating the X-inactivation processes responsible for the different patches of color on its coat. The cat has a mix of black and tan patches of fur, some small and some large. The cat's genotype is , where the large
Why do men have the same dosage as women?
Men have this dosage because, well, they only have one X chromosome! Women have the same dosage for a different reason: they shut down one of their two X chromosomes in a process called X-inactivation.
What is the name of the disorder where a woman lacks all of her chromosomes?
in Turner syndrome , a woman lacks part or all of one of her X chromosomes (leaving her with just one functional X). People with this disorder develop as females, but often have short stature and may exhibit symptoms like infertility and learning difficulties. Turner syndrome is thought to occur in about out of every female births. It has relatively mild effects because humans normally have only one X active in the cells of their body anyway.
