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The chromosomes are X and Y. You need two of these chromosomes When you are an egg in your mother ovaries, you only carry the 1 X chromosome. Women carry only XX Chromosomes Men only Carry XY Chromosomes. Upon fertilization, the male actually is responsible for donating the X chromosome, to make the baby a female, or his Y chromosome making it a male.
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Female sex chromosome = X Male sex chromosome = Y You need one pair of each chromosome type. Females are XX and since males start out as female, they still have an X after the second chromosome changes to a Y. So males are XY.
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For humans XX is female and XY is male. These represent one set of chromosomes. Hence, the presence or absence of the Y chromosome determines sex. They are also different in size if you look at a karyotype (picture of all the chromosomes lined up together)- The X chromosome is shorter than the Y chromosome. The X chromosome also carries many sex-linked genes.
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What are the sex chromosomes in human females and males?
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