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AQA A Level biology inheritance

The semen of prize dairy bulls may be collected for in vitro fertilisation. The sperms in the semen can be separated so that all the calves produced are of the same sex. The two kinds of sperms differ by about 3% in DNA content.

(i) Explain what causes the sperms of one kind to have 3% more DNA than sperms of the other kind.

Why does the X chromosome have more genes than Y?
Reply 1
there may be more reasons, but i think the sperm that have 3% more DNA have X chromosomes in them that allows for separation and the only reason X chromosomes have more genes than Y is literally because X chromosomes are larger

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