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Caption: 46 chromosomes in a human cell: two sex chromosomes and 22 pairs of ordinary chromosomes.
Download image: 348 K, 2400x1800,
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©2003 Howard Hughes Medical Institute.
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Caption: A pair of ordinary chromosomes: One from Mom and one from Dad.
Download image: 158 K, 475x1666,
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©2003 Howard Hughes Medical Institute.
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Caption: Ordinary chromosome pairs can swap parts, which allows injured (mutated) genes to be replaced over many generations.
Download image: 173 K, 508x1678,
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©2003 Howard Hughes Medical Institute.
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Caption: The X and Y chromosomes swap parts only at their tips.
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©2003 Howard Hughes Medical Institute.
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Caption: 1 of 8 palindromes in male-specific region of Y chromosome.
Download image: 166 K, 556x1651,
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©2003 Howard Hughes Medical Institute.
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Caption: Enlargement of a palindrome. One gene copy injured by mutation.
Download image: 126 K, 283x2066,
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©2003 Howard Hughes Medical Institute.
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Caption: Correction of mutation by copying from near-identical partner on opposite arm of palindrome.
Download image: 360 K, 1414x1726,
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©2003 Howard Hughes Medical Institute.
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