Formation of zones in the oocytes of certain plants and animals.

The last stage of meiotic prophase, immediately preceding the disappearance of the nuclear membrane.

Side-by-side pairing of chromosomes at meiosis. Cf. telosynapsis n. at telo-, comb._form1 affix.

The pairing of chromosomes in mitosis or meiosis. Cf. synapsis, n. 2.

Side-by-side pairing of chromosomes at meiosis; = parasynapsis, n. Cf. metasyndesis, n.

Genetics and Cell Biology. The failure of one or more pairs of homologous chromosomes (at meiosis) or sister chromatids (at mitosis) to separate…

Genetics and Cell Biology. The failure of homologous chromosomes to pair at meiosis.

Absence of synapsis; failure of chromosomes to pair in meiosis.

The arrest of cell division at the stage of metaphase, as a result of treatment with specific drugs which affect the mitotic spindle, such as…

Genetics and Cell Biology. Abnormal division of a chromosome, nucleus, or cell at meiosis or mitosis; esp. transverse, rather than longitudinal…

Biology. The movement of chromosomes to the spindle equator early in metaphase of mitosis.

an atypical form of duplication (duplication, n. 1e) in which the repeated segments lie immediately adjacent to one another on the same chromosome.