Question

After the first embryonic division in Parascaris equorum, there is an animal blastomere and a vegetal blastomere, as shown in the figure. The germ plasm is located at the most distal end, positioned away from the animal pole. At the end of the second division, only one of the cells retains the entire genome and becomes a stem cell. This is based on cytosolic factors contained within the germ plasm. The other three cells at this stage show a reduction in chromosome content via a process called chromosome diminution. If an experiment were performed that altered the distribution of the germ plasm in the animal and vegetable poles, what would be the expected result?

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a
No stem cells would be found at the four-cell stage.

b
One stem cell would be found at the four-cell stage.

c
Two stem cells would be found at the four-cell stage.

d
Three stem cells would be found at the four-cell stage.

e
Four stem cells would be found at the four-cell stage.

Answer 1

b
One stem cell would be found at the four-cell stage.