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प्रश्न
The zygote passes through several developmental stages till implantation, Describe each stage briefly with suitable diagrams.
उत्तर
The zygote passes through the following stages till implantations
- The embryo with 8-16 blastomeres is called a morula.
- The morula continues to divide and transforms into blastocyst as it moves further into the uterus.
- The blastomeres in the blastocyst are arranged into a surface layer called trophblast and a cluster of interior cells attached to the trophoblast are called the inner cell mass.
- The trophoblast layer then gets attached to the endometrium and inner mass cells get differentiated as embryo.
- After attachment, the uterine cells divide rapidly to cover the blastocyst.
- The blastocyst. becomes embedded in the uterin endometrium. This is called implantation.
Transport of ovum, fertilisation and passage of growing embryo through Fallopian tube
APPEARS IN
संबंधित प्रश्न
Briefly explain the events of fertilisation and implantation in an adult human female.
Name the hormones secreted and write their functions by corpus luteum and placenta (any two).
State three functions of the placenta
If mammalian ovum fails to get fertilized, which one of the following is unlikely?
Meroblastic cleavage is division ______.
What is true about cleavage in fertilized egg of human?
Test-tube baby means a baby born when ______.
Read the following and answer from given below:
Cleavage is the series of rapid mitotic divisions in the zygote and forms blastula. The 2, 4, 8, 16 daughter cells are called blastomeres. An embryo with 64 blastomeres is known as a blastocyst and has a blastocoel cavity. Blastocyst gets implanted in the uterine wall and leads to pregnancy.
The Site of implantation is ______
How does zona pellucida of ovum help in preventing polyspermy?
Where does the first cleavage division of zygote take place?
