Problem 1. Molecular Genetics A sea urchin mutation results in an unusual positioning of the mitotic spindle...

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Biology

Problem 1. Molecular Genetics
A sea urchin mutation results in an unusual positioning of themitotic spindle during the very first cleavage division:instead ofthe zygote dividing along the animal-vegetal axis, the cell is nowdividing perpendicular to the A-V axis (as if a globe were dividedin halves at the equator plane). You decide to repeat HansDrieschâ€™s 19th century experiments, carefully separate theresulting blastomeres and let them develop further.
True or false?
Since sea urchins are known to have highly regulativeearlydevelopment, you expect to see normally developing embryos.Explain youranswer.

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3.9 Ratings (725 Votes)

In most species the sexes are separate and indirect development produces a freeswimming larva that then undergoes metamorphosis at which point the juvenile emerges with the characteristic fivefold symmetry and grows into the adult About onefifth of all sea urchin species See Answer

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