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Nettie Stevens and Edmund Beecher Wilson described the XY sex determination system in 1905.

Q: When was it realised that it is the father who determines the sex of the child?

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Nettie Stevens and Edmund Beecher Wilson described the XY sex determination system in 1905.

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A sex chromosome helps in the determination of sex in an organism.

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The pair of chromosomes involved in sex determination is called sex chromosomes, rest of the chromosomes are called autosomes.

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The X chromosome is one of the two sex-determiningchromosomes in many animal species, including mammals (the other is the Y chromosome). It is a part of the XY sex-determination system and X0 sex-determination system. The X chromosome was named for its unique properties by early researchers, and this resulted in its counterpart being named the Y chromosome for the next letter in the alphabet when it was discovered later.

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Edmund Beecher Wilson and Nettie Stevens are credited with discovering, in 1905, the chromosomal XY sex-determination system; the fact that males have XY sex chromosomes and females have XX sex chromosomes.

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