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A mammalian egg undergoes Blank______ cleavage, forming a structure called a Blank______.Multiple choice question.meroblastic; blastocystmeroblastic; blastodischoloblastic; blastocystholoblastic; blastodisc

Question

A mammalian egg undergoes Blank______ cleavage, forming a structure called a Blank______.Multiple choice question.meroblastic; blastocystmeroblastic; blastodischoloblastic; blastocystholoblastic; blastodisc

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Solution

The correct answer is "holoblastic; blastocyst".

Step 1: Understanding the terms

  • Meroblastic cleavage: This is a type of cleavage in which there is incomplete division of the egg, common in species with yolk-rich eggs.
  • Holoblastic cleavage: This is a type of cleavage in which there is complete division of the egg, common in mammals including humans.
  • Blastocyst: This is a structure formed in the early development of mammals. It possesses an inner cell mass (ICM) which later forms the organism itself.
  • Blastodisc: This is a flat disc of cells on top of the yolk in the eggs of birds and reptiles.

Step 2: Matching the terms

  • Mammalian eggs undergo complete division, so the cleavage is holoblastic, not meroblastic.
  • The structure formed is a blastocyst, not a blastodisc which is found in birds and reptiles.

Therefore, the correct answer is "holoblastic; blastocyst".

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