2.1.1 ) Homologous pairs
2.1.2) 45
2.1.3) Gonosomes
2.1.4) The presence of a Y chromosome
2.1.5) chromosom mutation
2.1.6) Non disjunction occurred at position 21 during anaphase resulting in one gamete with 24 chromosomes. The fertilisation of this gamete with a normal gamete results in a zygote with 47 chromosomes. There are 3 chromosomes.
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