62. This karyotype would be from a male. I know this because it has one X-chromosome and one Y-chromosome. When there is an X and a Y chromosome, it is a male. If it were two X-chromosomes, it would be female.
63. Down Syndrome is caused when there is three rather that two chromosome 21. This is caused by non-disjuntion which is when a chromosome fails to separate from it homologue during meiosis and one gamete receives and extra copy of a chromosome and another gamete is missing one.
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