NEETZoologyHuman Reproduction
What is the zygote called after dividing into 8-16 daughter cells?
Options
- ABlastomeres
- BMorula
- CBlastocyst
- DEmbryo
Correct answer
B. Morula
Step-by-step solution
The mitotic division starts as the zygote moves through the isthmus of the oviduct called cleavage towards the uterus (Figure 2.11) and forms 2, 4, 8, 16 daughter cells called blastomeres. The embryo with 8 to 16 blastomeres is called a morula (Figure 2.11e). The morula continues to divide and transforms into blastocyst (Figure 2.11g) as it moves further into the uterus. The blastomeres in the blastocyst are arranged into an outer layer called trophoblast and an inner group of cells attached to trophoblast called t