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During metaphase, all chromosomes look like an X with the exception of the chromosome Y. See below

Why Y then? Well, according to wikipedia, just because the letter Y follows the letter X in the alphabet.

Note that many species don't have sexual chromosomes and note that in many species, the Y-looking chromosome is present in the female but not in the male. In such case we call this Y-looking chromosome W and we call the X-looking chromosome Z. Very likely this post will interest you.

During metaphase, all chromosomes look like an X with the exception of the chromosome Y. See below

Why Y then? Well, according to wikipedia, just because the letter Y follows the letter X in the alphabet.

Note that many species don't have sexual chromosomes and note that in many species, the Y-looking chromosome is present in the female but not in the male. In such case we call this Y-looking chromosome W and we call the X-looking chromosome Z. Very likely this post will interest you.

During the metaphase, all chromosomes look like an X to the exception of the chromosome Y. See below

Why Y then? Well, according to wikipedia, just because the letter Y follows the letter X in the alphabet.

Note that many species don't have sexual chromosomes and note that in many species, the Y-looking chromosome is present in the female but not in the male. In such case we call this Y-looking chromosome W and we call the X-looking chromosome Z. Very likely this post will interest you.

During metaphase, all chromosomes look like an X with the exception of the chromosome Y. See below

Why Y then? Well, according to wikipedia, just because the letter Y follows the letter X in the alphabet.

Note that many species don't have sexual chromosomes and note that in many species, the Y-looking chromosome is present in the female but not in the male. In such case we call this Y-looking chromosome W and we call the X-looking chromosome Z. Very likely this post will interest you.

During the metaphase, all chromosomes look like an X to the exception of the chromosome Y. See below

Why Y then? Well, according to wikipedia:

Stevens named the chromosome "Y" simply to follow on from Henking's "X" alphabetically.

Note that many species don't have sexual chromosomes and note that in many species, the Y-looking chromosome is present in the female but not in the male. In such case we call this Y-looking chromosome W and we call the X-looking chromosome Z. Very likely this post will interest you.

During the metaphase, all chromosomes look like an X to the exception of the chromosome Y. See below

Why Y then? Well, according to wikipedia, just because the letter Y follows the letter X in the alphabet.

Note that many species don't have sexual chromosomes and note that in many species, the Y-looking chromosome is present in the female but not in the male. In such case we call this Y-looking chromosome W and we call the X-looking chromosome Z. Very likely this post will interest you.