Part F A student has drawn a series of metaphase I cells to show the principle o

Question

Part F A student has drawn a series of metaphase I cells to show the principle of independent assortment. Which cell does not belong in the series? A student has drawn a series of metaphase I cells to show the principle of independent assortment. Which cell does not belong in the series? A metaphase I cell with a circle containing six vertical pairs of lines attached at the middle, stacked in two rows of three. On the left, from top to bottom are a short blue pair, a medium-length blue pair, and a long red pair. On the right, from top to bottom are a short red pair, a medium-length red pair, and a long blue pair. A metaphase I cell with a circle containing six vertical pairs of lines attached at the middle, stacked in two rows of three. On the left, from top to bottom are a short red pair, a medium-length blue pair, and a long red pair. On the right, from top to bottom are a short blue pair, a medium-length red pair, and a long blue pair. A metaphase I cell with a circle containing six vertical pairs of lines attached at the middle, stacked in two rows of three. On the left, from top to bottom are a short blue pair, a medium-length red pair, and a long blue pair. On the right, from top to bottom are a short blue pair, a medium-length red pair, and a long blue pair. A metaphase I cell with a circle containing six vertical pairs of lines attached at the middle, stacked in two rows of three. On the left, from top to bottom are a short red pair, a medium-length blue pair, and a long blue pair. On the right, from top to bottom are a short blue pair, a medium-length red pair, and a long red pair. A metaphase I cell with a circle containing six vertical pairs of lines attached at the middle, stacked in two rows of three. On the left, from top to bottom are a short red pair, a medium-length red pair, and a long red pair. On the right, from top to bottom are a short blue pair, a medium-length blue pair, and a long blue pair.

Explanation / Answer

The student has drawn 5 images of metaphase I cells. The most important aspect of independent assortment is that the chromosomes can align in any possible ways and thus can create different combinations. The short red, blue red can combine in two wats, SR-BR or BR_SR. Similarly, we can have multiple possible combinations. However, in one of the image, the combination is SB, MR, LB and SB, MR, LB. this combination is missing with SR, MB, LR. Hence this cannot be the right combination. Hence the one which does not belong to the series is:
A metaphase I cell with a circle containing six vertical pairs of lines attached at the middle, stacked in two rows of three. On the left, from top to bottom are a short blue pair, a medium-length red pair, and a long blue pair. On the right, from top to bottom are a short blue pair, a medium-length red pair, and a long blue pair.

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