Question

If the n = 16 in the plant cell then what is possible in metaphase I of meiosis?
(a) 32 bivalents
(b) 16 tetravalents
(c) 16 bivalents
(d) 32 tetravalent

Answer 1

Hint: The homologous chromosomes are orchestrated in the focal point of the cell with the kinetochores looking inverse poles. The homologous sets situate themselves subjectively at the equator. They contain slight contrasts in their hereditary data, making every gamete have extraordinary hereditary makeup.

Complete answer:
The plant cell contains n = 16, where n speaks to the haploid number of chromosomes. The plant cell which will experience meiotic division will contain the diploid number of chromosomes, 2n = 32.

In the S-phase, the cell replicates the genetic material to form the 32 replicated chromosomes. The homologous chromosomes are adjusted together in the metaphase I to frame the bivalent.
So, if 32 chromosomes pair up with the homolog, this will result in the formation of 16 bivalents.

Additional information: The centrioles are at inverse shafts of the cell.
The sets of homologous chromosomes (the bivalents), presently as firmly curled and consolidated as they will be in meiosis, get orchestrated on a plane equidistant from the shafts called the metaphase plate.
The spindle fibers from one pole of the cell are combined with one chromosome of each pair (seen as sister chromatids), and spindle fibers from the opposite pole are combined to the homologous chromosome (once more, seen as sister chromatids).
So the correct answer is ’(c) 16 bivalents’.

Note: In an organism with two sets of chromosomes, there are four ways in which the chromosomes can be arranged, resulting in differences in the chromosomal distribution in daughter cells after meiosis I. (The diploid organism with 2n chromosomes will have ${ 2 }^{ n }$ possible combinations or ways of arranging its chromosomes during metaphase I.)