Which of the species has a egg that is not classified as isolecithal. amphioxus

Question

Which of the species has a egg that is not classified as isolecithal. amphioxus molluscs mammals amphibians nematodes The blastopore is formed by which cells. an area described by Spemann and Mangold an area described by Nieuwkoop An area described by Weismann an ares described by Roux In sea urchins cleavage is: spiral holoblastic Rotational holoblastc Radial holoblastic Displaced radial holoblastie Which species does exhibit a holoblastic cleavage pattern Amphibians Nematodes Mollusks Tunicates Echinoderms

Explanation / Answer

30.The correct answer is:nematodes

Reason:All other options mentioned have isolecithal eggs.

31.The correct answer is:An area described by Spemann and Mangold

Reason:Spemann and Mangold described the area of cells that form blastopore.

32.The correct answer is:Radial holoblastic

Reason:Sea urchin undergo radial,reductive and holoblastic cleavage.

33.The correct answer is:All are correct

Reason: All the above species show holoblastic cleavage pattern. See the table in the reference link :(https://en.wikipedia.org/wiki/Cleavage_(embryo)

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