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Sex cells have either one X or one Y chromosome. Male offspring have XY and female offspring have XX. In the case of two X's, one is inactivated. This a random act in the cells' early development.
It can be seen easily in cats as their coat color genes are found on the X chromosome. In female cats, one X may have the gene for black and the other may have the gene for red. When this is expressed, a mixture of red and black is seen. This color pattern is called a tortoiseshell. These cats are almost always female.
The male will be either black or red. The colors can also be dilute (blue and cream) with the same pattern. Males that have an extra X chromosome can show the same pattern as females.
What else can I help you with?
Does x-inactivation happen in klinefelters syndrome?
X-inactivation typically occurs in individuals with Klinefelter syndrome, which is characterized by having an extra X chromosome (XXY). However, the extra X chromosome in Klinefelter syndrome may not undergo inactivation completely, leading to some cells expressing genes from the additional X chromosome. This can result in a variety of symptoms and characteristics associated with Klinefelter syndrome.
What type of trait might be affected by the inactivation of an x chromosome?
The inactivation of an X chromosome can affect traits that are linked to genes located on the X chromosome. This phenomenon, known as X-inactivation or Lyonization, leads to the expression of only one of the two X chromosomes in females, impacting traits such as color vision, hemophilia, and certain autoimmune disorders. Consequently, females may exhibit a mosaic pattern of traits, with some cells expressing genes from one X chromosome and others from the other. This can result in variable expression of X-linked traits depending on which X chromosome is inactivated in different cells.
What is the x chromosome inactivation?
this is the process by which one of the two copies of the X-chromosomes present in female animals is inactivated
Which term describes something that happens in female mammals?
X chromosome inactivation happens in female mammals.
How is x inactivation an exception to Mendel's laws?
X inactivation is an exception to Mendel's laws because it involves the inactivation of one of the two X chromosomes in females, allowing for dosage compensation between males and females. This process results in the random silencing of one X chromosome and the formation of Barr bodies, altering the expected patterns of inheritance predicted by Mendel's laws.
What is x chromosome inactivation in human system?
its not inactive
Does x-inactivation happen in klinefelters syndrome?
X-inactivation typically occurs in individuals with Klinefelter syndrome, which is characterized by having an extra X chromosome (XXY). However, the extra X chromosome in Klinefelter syndrome may not undergo inactivation completely, leading to some cells expressing genes from the additional X chromosome. This can result in a variety of symptoms and characteristics associated with Klinefelter syndrome.
What type of trait might be affected by the inactivation of an x chromosome?
The inactivation of an X chromosome can affect traits that are linked to genes located on the X chromosome. This phenomenon, known as X-inactivation or Lyonization, leads to the expression of only one of the two X chromosomes in females, impacting traits such as color vision, hemophilia, and certain autoimmune disorders. Consequently, females may exhibit a mosaic pattern of traits, with some cells expressing genes from one X chromosome and others from the other. This can result in variable expression of X-linked traits depending on which X chromosome is inactivated in different cells.
What accounts for the mosaic color pattern of a female calico cat?
X chromosome inactivation
Occurs when one x-chromosomes is randomly turned off and forms a barr body?
X-chromosome inactivation is a normal process in female mammals where one of the two X chromosomes is randomly inactivated in each cell during embryonic development. The inactivated X chromosome forms a structure called a Barr body, which helps to equalize gene expression between males (XY) and females (XX). This process ensures that both males and females have a similar dosage of X-linked genes.
What is the x chromosome inactivation?
this is the process by which one of the two copies of the X-chromosomes present in female animals is inactivated
Which term describes something that happens in female mammals?
X chromosome inactivation happens in female mammals.
Why does x inactivation occurs in female not in male?
Male carry XY genotype whereas female has XX. Two copies of X chromosome means, there is a great chance of potentially toxic double dose of X-linked genes. It is known that 1000s of genes responsible for growth and cell viability are there in X chromosomes.To avoid the over production of these genes in female (where 2 X chromosomes present), there is a mechanism evolved that transcriptionally control or silence on of these two X chromosome.http://www.nature.com/scitable/topicpage/x-chromosome-x-inactivation-323
How is the X chromosome inactivated?
X chromosome inactivation is a process that occurs in female mammals where one of the X chromosomes in each cell is randomly inactivated. This ensures that both males and females have similar levels of X chromosome gene products. The inactivated X chromosome condenses into a structure called a Barr body.
How might x inactivation cause patchy hairiness on women who have congenital generalized hypertrichosis even though the disease causing allele is dominant?
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.
Why is X-inactivation necessary in individuals with two X chromosomes?
X-inactivation is necessary in individuals with two X chromosomes to ensure that only one X chromosome is active in each cell. This process helps to balance gene expression between the two X chromosomes and prevent an imbalance of gene dosage, which could lead to developmental abnormalities and disorders.
How is x inactivation an exception to Mendel's laws?
X inactivation is an exception to Mendel's laws because it involves the inactivation of one of the two X chromosomes in females, allowing for dosage compensation between males and females. This process results in the random silencing of one X chromosome and the formation of Barr bodies, altering the expected patterns of inheritance predicted by Mendel's laws.
