Which of the following cell models is a correct illustration of metaphase i for a 2n = 4 cell?
a. a cell model consisting of a circle containing four vertical lines stacked in two rows of two. on the left there is a medium-length blue line above a long blue line.
b. on the right there is a medium-length red line above a long red line.
c. a cell model consisting of a circle containing four randomly arranged pairs of lines attached at the middle including: a long blue pair, a medium-length blue pair, a medium-length red pair, and a long red pair.
d. a cell model consisting of a circle containing four stacked vertical pairs of lines attached at the middle. the first pair is short with blue lines. the second pair is short with red lines.
e. the third pair is medium-length with blue lines.
f. the fourth pair is medium-length with red lines.
g. a cell model consisting of a circle containing four vertical pairs of lines attached at the middle, stacked in two rows of two.
h. on the left there is a medium-length blue pair above a long red pair. on the right there is a medium-length red pair above a long blue pair. a cell model consisting of a circle containing two stacked vertical pairs of lines attached at the middle.
i. the top pair is medium-length, with a blue line on the left and a red line on the right.
j. the bottom pair is long, with a blue line on the left and a red line on the right.

g. A cell model consisting of a circle containing four vertical pairs of lines attached at the middle, stacked in two rows of two.

Explanation:

In Metaphase I of the cells, homologous chromosome pairs are lined up next to each other which is defined as synapsis. Each pair of two chromosomes (bivalents) consists of four chromatids in total are positioned on the metaphase plate.

Metaphase I occurs when tetrads of chromosomes are lined up along the equator of the spindle. Spindle fibres are attached to the centromere region of each homologous chromosome pair. These homologous chromosomes consist of the matching alleles originating from mother and father.

In Metaphase I, meiotic recombination (''crossing over'') happens. Meiotic recombination means there is a genetic shuffling of the attributes of both parents. A result is a large number of possible genetic combinations. It is estimated that there is a 50-50 chance for the daughter cells to receive or mother's or father's homologous for each chromosome. In an organism with 2 sets of chromosomes, there are 4 ways in which the chromosomes may be arranged. This is resulting in differences in the chromosomal distribution in daughter cells after meiosis I.

g. A cell model consisting of a circle containing four vertical pairs of lines attached at the middle, stacked in two rows of two.

Further explanation

Cell division can be a process that divides one somatic cell into two or more daughter cells. organic process is usually atiny low an element of an even bigger cell cycle.

Cell division in prokaryotes is assumed as binary division (binary physics) or direct organic process. This division is supposed for the aim of reproduction. The resulting cell can be a cell that has its own autonomy. organic process in eukaryotes is of two types, namely mitosis and meiosis. Mitosis produces daughter cells which will divide again, while meiosis converts a cell into a gamete that can't divide again until fertilization.

mitosis can be a spread of organic process that's capable of producing 2 genetically similar saplings. Meaning, with the two sapling cells formed have the identical genetic makeup because the parent.

meiosis can be a spread of organic process that produces 4 haploid (n) sapling cells that originate from diploid stem cells (2n). during this case, each child cell has half the somatic cell chromosome.

In general, to differentiate between mitosis and meiosis, namely supported various aspects including the aim of the tactic, the quantity of organic process, the division and also the character of the daughter's cells

These homologous chromosomes contains the matching alleles originating from mother and father.

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Cell division :

Details

Class: college

Subject: biology

Keywords : cell, mitosis, meiosis, metaphase, division

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