46是指人体的染色体条数，用不同的符号表示他们，其中XX是指性染色体（女性XX,男性XY）
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第1个回答 2008-11-18
chromosomes have long arms and short arms
8p12: short arm of chromosome 8, position 12
13q22: long arm of chromosome 13, position 22
Humans have 46 chromosomes.
XX is a female.
8p12: short arm of chromosome 8, position 12
13q22: long arm of chromosome 13, position 22
Humans have 46 chromosomes.
XX is a female.
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