結果 : what does having x and y chromosomes mean
2:25

X and Y chromosomes explained

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How Cells Decide Between X And Y Chromosomes? Explained

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Can you be a girl with a XY chromosome?

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Sex Inheritance (XX XY) - GCSE Biology | kayscience.com

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Secrets of the X chromosome - Robin Ball

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Genes, DNA and Chromosomes explained

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Sex Determination | Genetics | Biology | FuseSchool

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X and Y Chromosomes: Main differences.

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The X and Y Chromosomes DON'T Determine Your Sex

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Science Proves There are More than Two Human Sexes

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Why Y Chromosomes Might Disappear

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Human Chromosome 3-D

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Boy or girl?

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