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
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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