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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
Wiki User
∙ 9y ago
Wiki User
∙ 6y agoSince there are two X chromosomes in most female animals one of the two becomes an inactive Barry body to facilitate proper cell function. in some animals the inactivation is random in others the X chromosome provided by the male is always inactivated.
Wiki User
∙ 9y agoSpecies of animals where the sex chromosomes of females are XX generally produce Barr bodies with only one active X chromosome in each cell. The inactivated X chromosome becomes a Barr body. Male animals with this type of chromosome configuration are either X or XY where the Y chromosome is considerably diminished when compared to the X. X inactivation is random and essentially mimics the functional behavior of the cells of a male animal of the same species making function of somatic cells the same for both sexes. This site has information on this process and can be found by searching for Barr Body.
Wiki User
∙ 13y agoBecause the male already has only one copy of the X chromosome. If females did not have the x inactivation then they would have two copies of the same genes
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What is the difference between x-inactivation and genomic imprinting?
The difference between them is that : In genomic imprinting : one of the alleles in the two chromosomes ( for example the color of the eyes ) are tend to be heavily methylated, in contrast to the nonimpringting copy of the allele which typically is not methylated. In X-chromosome in activation : As you know in female there are two X chromosomes, so one of the two X xhromosomes is methylated which mean one of the two chromosomes become inactivation.
How many genotypes are possible in a pedigree of sex linked traits?
xx = normal female x- x = carrier female x- x- = female which has the sex-linked trait xy = normal male x- y = male which has the sex-linked trait
The sex of offspring is determined by the chromosome the female parent gives it?
hello, i add, meta-logically, may the single plate of DNA or genome which carry the symbol X be female, and the single plate of DNA or genome which carry the symbol Y be male, thus may the female child came from the female mother. thus the single plate of chromosome specify gender type but not the chromosome pair specify the gender type.
Name one pair of chromosomes not homologous in a normal karyotype?
The X (female) and Y (male) chromosomes. A person with XX is female. A person with XY is male.
A human baby is born with two X chromosomes. What must be true about this baby?
the baby is a female
Occurs when one x-chromosomes is randomly turned off and forms a barr body?
An X-inactivation occurs when one X-chromosome is randomly turned off and forms a Barr body. It is also known as lyonization.
Which term describes something that happens in female mammals?
X chromosome inactivation happens in female mammals.
What accounts for the mosaic color pattern of a female calico cat?
X chromosome inactivation
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
How can you identify the difference of a female chromosome and a male chromosome?
What differentiates a male from a female based off the chromosomes that are present is that a male organism will have X and Y chromosomes whereas a female organism will have X and X chromosomes.
How do you connect a male faucet aerator to a male faucet?
Female x Female coupling
What is x chromosome inactivation in human system?
its not inactive
What is responsible for the sex of male and female offspring?
The sex chromosomes, X and Y. Having two X's makes you female, and an X and Y makes you a male.
Is the male or female more responsible for the sex of the fetus?
The male. He carries an X and Y chromosome. If he gives an X, the fetus is female. If he gives a Y, the fetus is male.
How many sex chromosomes does a male embryo have?
An embryo, male or female, usually has two sex chromosomes, one from mom, one from dad. In a male's case, they would be XY. Rarely, nondisjunction occurs, and a child winds up XXX, XXY, XYY, or X. XXX and X become female, and XXY and XYY become male. So, it is theoretically possible for a male embryo to have three sex chromosomes.
How do you know if your hamster is a male or a female?
for males they have O shaped pink dots. there should be two on a male and a female. on a female there is an X
How do you know the set of chromosomes is from a male?
If it has a x and y chromosome it is from a male if it has two x chromosome or is from a female
