Barr body is associated with (a)Y-chromosome (b)X-chromosome (c)Autosome (d)Male sex only
Hint: This chromosome is present in both the parents but is different in numbers. It consists of around 900 to 1400 genes translated from around 155 million base pairs that carry 5 % of total DNA in their cell. Hemophilia or bleeder’s disease is associated with this chromosome.
Complete answer: Barr bodies are the inactive form of X-chromosome present in the cell having one or more than one X-chromosomes. They are found mostly in the sex determination of XY-type which includes humans.
Additional Information: -The X-chromosome is a sex-determining chromosome, also called as allosome. -It is found in both male and female individuals. -It is present along with its counterpart Y-chromosome on male individuals. -In females, two X-chromosomes are present while in males only one X-chromosome is found. -The pattern of X-chromosome inheritance is criss-cross, where the male parent will inherit X-chromosome to female offspring which is then inherited to the male offspring. -The disease which occurs due to the mutation on X-chromosomes is known as X-linked disease. -The X-chromosome is larger than the Y-chromosome and has more euchromatin regions. -The increase or decrease in the normal number of X-chromosome in an individual will result in an abnormality. -X-chromosomes are said to be associated with the development of intelligence. -The Y-chromosome is responsible for maleness in an individual while X-chromosome is responsible for femaleness. -Few examples of X-linked recessive disorders are hemophilia, color-blindness, muscular dystrophy, etc.
So, the correct answer is, “X-chromosome.”
Note: The Barr body was discovered in 1938 by a Canadian physician Murray Barr. This occurs due to the inactivation of the X-chromosome due to the process of Ionization (packed in an inactive structure called heterochromatin). Its most common example is of Klinefelter syndrome having 47+XXY chromosomal composition with a single Barr body and if the composition is 47+XXX then there will be two Barr bodies.
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