Question

Cleavage in the fertilized egg of humans _________

• A. Starts in uterus
• B. Is meroblastic
• C. Starts when egg is in fallopian tube
• D. Is discoidal

Answer 1

The correct option is C Starts when egg is in fallopian tube

• Cleavage is the rapid mitotic divisions of the fertilized egg or zygote.
  
• The first cleavage starts in the upper portion of the fallopian tube after around 28-30 hours of fertilization.
• The cleavage of zygote results in the formation of 8-16 celled stage known as a morula. The cells of the zygote are known as blastomeres.
• Cleavage in humans is holoblastic as blastomeres divide completely.

So, the correct answer is 'Starts when egg is in fallopian tube'.