Which of the following is the first change that occurs to the zygote after fertilisation?
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a
It divides to form a hollow ball of cells, called the blastocyst.
b
It begins to secrete the hormones.
c
It contacts the endometrial wall of the uterus and becomes buried inside it.
d
It initiates the formation of a placenta.
answer is A.
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Detailed Solution
The zygote divides mitotically to form 8 -16 daughter cells called blastomeres. This stage is a solid stage called morula which continues to divide and transforms into a hollow stage called blastocyst.