13 terms

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Synapsis
Pairing of homologous chromosomes
Tetraploid
4 sets of chromosomes
Meiosis
Cell division that produces reproductive cells in sexually reproducing organisms
Meiosis 2
reproduction process that splits the sister chromatids and results in haploid cells
Nondisjunction
Error in meiosis in which homologous chromosomes fail to separate.
Tetrad
structure containing 4 chromatids that forms during meiosis
Zygote
Fertilized egg
Monosomy
Chromosomal abnormality consisting of the absence of one chromosome from the normal diploid number
Meiosis 1
reproduction process that halves the # of chromosomes and results in diploid cells
Triploid
A chromosomal mutation where an organism has three sets of chromosomes (3n) instead of two (2n)
Fertilization
Process in sexual reproduction in which male and female reproductive cells join to form a new cell
Crossing over
Process in which homologous chromosomes exchange portions of their chromatids during meiosis.
Trisomy
3 copies of a chromosome
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