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Sex cells have 1/2 the number of chromosomes of a normal cell (23)
Adult= 6-20 Child= 5-18 Elderly Adult (60+) = 8-23
A normal karyotype will show all 23 chromosomes at normal growth, and the end will show an either XY (boy) or XX (girl). Karyotypes of people with autosomal diseases and other diseases associated with chromosomes will show abnormalities on that certain chromosome. For example, Down syndrome is caused by a whole extra chromosome on chromosome 21. This extra chromosome can be seen on the karyotype.
In a gamete (sex) cell, there are 23 chromosomes. A gamete is a haploid, or n, whereas a somatic (normal) cell is a diploid, or 2n, and has 46 chromosomes.
Haploid cells, as opposed to diploid cells. Haploid cells contain only 23 chromosomes, but normal diploid cells contain 46 chromosomes.