describe the process that occurs in zygote and results in increased in cell number and cytoplasm - Biology - Molecular Basis of Inheritance

Question

describe the process that occurs in zygote and results in increased
in cell number and cytoplasm

Priyanka Sahu · Accepted Answer

Solution:

After the formation of
zygote, mitosis starts as the zygote moves through the isthmus of
the oviduct (cleavage) and forms 2, 4, 8, 16 daughter cells called
blastomeres

The 8−16 cell embryo
is called a morula, which continues to
divide to form the blastocyst The morula moves
further into the uterus

The cells in the
blastocyst are arranged into an outer trophoblast and an
inner cell
mass

The trophoblast gets
attached to the uterine endometrium, and the process is called
implantation This leads to pregnancy

Immediately after implantation, the inner cell mass (embryo) gets
differentiated into the ectoderm, mesoderm and endoderm, which give
rise to the different tissues This ability of the inner cell mass
is due to the presence of multi-potent cells called stem cells

Most of the major organs are formed at the end of 12 weeks of
pregnancy; during the 5th month, the limbs and body
hair are formed; by the 24th week, the eyelids separate
and eyelashes are formed At the end of nine months, the foetus is
fully formed