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.

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.

luisvaschetto luisvaschetto · Answer 2 · 2022-03-31T13:23:24+02:00

A cell model with a circle containing four vertical pairs of lines attached at the middle, stacked in two rows of two is a correct illustration of metaphase I for a 2n = 4 cell (Option g).

What is metaphase?

Metaphase is a step in mitosis which is characterized by the alignment of homo-logous chromosomes.

Homo-logous chromosomes are chromosomes having the same or nearly identical sequence.

During metaphase, homo-logous chromosomes are located at the equatorial plate of the cell.

In conclusion, a cell model with a circle containing four vertical pairs of lines attached at the middle, stacked in two rows of two is a correct illustration of metaphase I for a 2n = 4 cell (Option g).

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