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Question
Correct sequence in the development of zygote is
Correct sequence in the development of zygote is
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Solution
The correct option is A Fertilization ⟶ Zygote ⟶ Cleavage ⟶ Morula ⟶ Blastula ⟶ Gastrula
Development starts with fertilisation where the fusion of gametes (ova and sperm) takes place, which results in the formation of zygote. In the embryonic development of humans and other animals, the zygote stage is brief and is followed by cleavage, when the single cell becomes subdivided into smaller cells. Development starts with morula phase, which is an early stage embryo, consisting of cells (called as blastomeres) in a solid ball contained within the zona pellucida, which is followed by blastula (is a hollow sphere of cells, referred to as blastomeres, surrounding an inner fluid-filled cavity, called as the blastocoel). The last stage is gastrula during which the single-layered blastula is reorganised into a trilaminar ("three-layered") structure, known as the gastrula. Thus, the correct answer is option A.
Development starts with fertilisation where the fusion of gametes (ova and sperm) takes place, which results in the formation of zygote.
In the embryonic development of humans and other animals, the zygote stage is brief and is followed by cleavage, when the single cell becomes subdivided into smaller cells.
Development starts with morula phase, which is an early stage embryo, consisting of cells (called as blastomeres) in a solid ball contained within the zona pellucida, which is followed by blastula (is a hollow sphere of cells, referred to as blastomeres, surrounding an inner fluid-filled cavity, called as the blastocoel).
The last stage is gastrula during which the single-layered blastula is reorganised into a trilaminar ("three-layered") structure, known as the gastrula. Thus, the correct answer is option A.
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