Question

Bivalents in meiosis are
A. Tetrad
B. Pairs of non- homologous chromosomes
C. Pairs of several chromatids
D. Pairs of homozygous chromosomes

Answer 1

During the prophase of meiosis I homologous chromosomes pair and form neurotransmitters. The combined chromosomes are called bivalents. The bivalent has two chromosomes and four chromatids, with one chromosome coming from each parent.

Complete answer:
-Meiosis is described by the pairing of homologous chromosomes. Each such pair of the homologous chromosome is composed of two sister chromatids. In this way, each pair is really a quadruplicate of chromatids. Two of these chromatids which are combined at centromere are called sister chromatids. -Each pair of sister chromatids is non-sister chromatid for the other pair of sister chromatids.
-Contrasted with mitosis, which can happen very quickly, meiosis is a moderate cycle, generally in view of the time that the cell spends in prophase I. During prophase I, the sets of homologous chromosomes meet up to shape a quadruplicate or bivalent, this contains four chromatids.
-At the meiotic metaphase I, the cytoskeleton puts the bivalents under pressure by pulling each homolog inverse way (in spite of mitotic division where the powers are applied on every chromatid). The harbor of the cytoskeleton to the chromosomes happens at the centromere on account of a protein complex called kinetochore. This strain brings about the arrangement of the bivalent at the focal point of the phone, the chiasmata and the distal attachment of the sister chromatids being the anchor point supporting the power applied all in all structure.

Hence, the correct answer is option (A).

Note: Human female essential oocytes stays in this pressure state for quite a long time (from the foundation of the oocyte in metaphase I during undeveloped turn of events, to the ovulation occasion in adulthood that continue the meiotic division), featuring the heartiness of the chiasma and the attachment that hold the bivalents together.