Karyotype Notes. A karyotype is a “ picture ” of a person ’ s chromosomes. Each person has 46 chromosomes, in 23 pairs. Pairs 1-22 are called Autosomes.

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Karyotype Notes

A karyotype is a “ picture ” of a person ’ s chromosomes. Each person has 46 chromosomes, in 23 pairs. Pairs 1-22 are called Autosomes Pair # 23 determines sex. XX= female XY= male.

What is this person’s sex? female

If a person is either missing a chromosome, or has an extra chromosome, the result will be a mutation. A missing chromosome is called monosomybecause only one is left. An extra chromosome is called trisomy because there are 3. This person has trisomy 21 which results in Down syndrome.