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Y CHROMOSOME

Y CHROMOSOME

 The Y chromosome is one of the two sex chromosomes in humans (the other is the X
chromosome).
 The sex chromosomes form one of the 23 pairs of human chromosomes in each cell.
 The Y chromosome is present in males, who have one X and one Y chromosome.
 Sex is determined by the SRY gene on the Y chromosome, which is responsible for the
development of a fetus into a male.
 Other genes on the Y chromosome are important for male fertility. Many genes are unique to the
Y chromosome.
 Genes present in areas known as pseudoautosomal regions take part in pairing during meiosis.

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 A karyotype refers to a full set of chromosomes from an individual arranged according to length, position of centromere, banding pattern.  Karyotype is written as total number of chromosomes followed by sex chromosomes  Normal male karyotype: 46,XY, normal female karyotype: 46,XX  Chromosomes are classified into 7 groups and pasted accordingly- Group A- 1, 2, 3; group B- 4, 5; group C- 6-12, X; group D- 13, 14, 15; group E- 16, 17, 18; group F- 19, 20; group G- 21, 22, Y