Haploid - organisms with just one of each type of chromosome (Humans have 23 different types of chromosomes n=23)Diploid - organisms with two of each type of chromosome (In humans all cells except gametes are diploid and contain 46 chromosomes 2n=46)Alleles - different versions of a specific geneSister chromatids - two identical chromatids copies in a replicated chromosomeBivalents - homologous replicated chromosomes that are joined together during prophase I and metaphase I of meiosisChiasma -the point of contact, the physical link, between two (non-sister) chromatids belonging to homologous chromosomesZygote - the cell that results from fertilization. Zygote develops through mitosis into an adult of the next generation

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