symmetric about the x axis   2 videos

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  Sex Chromosomes

  Biology Cell Division and Reproduction

  The description of sex chromosomes.

  sex chromosomes X Y XX XY gender autosomes karyotype
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  Sex-Linked Genes

  Biology Cell Division and Reproduction

  Understanding sex-linked genes in reproduction.

  sex linked genes XX XY X chromosome Mendel hemizygous homozygous heterozygous genetics