Thursday, October 1, 2009

Sex Chromosome (Short Note)

Chromosomes which are similar in males and females of same species are called autosomes and the chromosomes which are different in them are called sex chromosomes. Each individual possesses a pair of sex chromosomes which are designated as X and Y. The male possesses XY and female possesses XX chromosomes but in some animals the position is reversed e.g. moths, birds and some fishes. In them it is the female which possesses a pair of unlike chromosomes whereas male has like chromosome. To avoid the confusion, the sex chromosome in such animals is called Z instead of X and the other member is called W. thus the genetic constitution in female is ZW and male ZZ.

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