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Meiosis
Term | Definition |
---|---|
Gamete(s) | reproductive cells |
Haploid | a single set of unpaired chromosomes |
Oogenesis | production or development of an ovum |
Ovum/ova | mature female reproductive cell |
Sperm | male reproductive cell |
Zygote | fertilized egg |
Tetrad | set of 4 |
Synapsis | fusion of chromosome pairs at the start of meiosis |
Fertilization | two gametes fuse to become a zygote |
Disjunction | homologous chromosomes move apart toward the opposite poles of the cell in anaphase I and sister chromatids separate and move away from each other during anaphase II |
Gametogenesis | cells undergo meiosis to form gametes |
Homologous chromosome | chromosome pairs that are similar in length, gene position, and centromere location |
Crossing over | the exchange of genes between homologous chromosomes, resulting in a mixture of parental characteristics in offspring |
Gonads | reproductive organs |
Spermatogenesis | the production or development of mature spermatozoa. |
Polar Bodies | each of the small cells which bud off from an oocyte at the two meiotic divisions and do not develop into ova |
Meiosis | a type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores. |
Variation | a different or distinct form or version of something. |
Nondisjunction | failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division |
Genes | a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring. |