Chromosomes form tetrads during the prophase I phase of meiosis, according to Biology Online. Tetrads occur when synapsis within the cell causes four chromatids to form as part of a homologous pair of chromosomes. More »

Tetrads, four-part structures made up of two homologous chromosomes, form during prophase I of meiosis. During this phase, chromosomes exchange genetic material with other chromosomes in the tetrad. The process is referr... More »

Tetrads, also known as bivalents, form during the prophase 1 stage of meiosis when duplicated chromosomes, each composed of two identical chromatids, pair up and complete the process of crossing over in which one chromos... More »

Tetrads, four-part structures made up of two homologous chromosomes, form during prophase I of meiosis. During this phase, chromosomes exchange genetic material with other chromosomes in the tetrad. The process is referr... More »

Chromosomes become visible during prophase, the stage of mitosis during which the nuclear envelope disappears and the chromosomes shorten and condense. After prophase, chromosomes remain visible until mitosis completes. More »

Chromatin condenses to form chromosomes during prophase of mitosis, and during prophase I and prophase II of meiosis. Chromatin is a dense, complex fibrous structure composed of associated proteins and molecules of deoxy... More »

The chromosomes in a cell's nucleus coil during prophase of mitosis in order to facilitate mobility. The chromosomes and the DNA become coiled and condensed during prophase. More »