Which of the following is the correct sequence of missing events in the diagram given below:
Correct answer: C. Fertilization -> Cleavage -> Gastrulation -> Organogenesis
- A. Cleavage -> Fertilization -> Organogenesis -> Gastrulation
- B. Organogenesis -> Gastrulation -> Fertilization -> Cleavage
- C. Fertilization -> Cleavage -> Gastrulation -> Organogenesis
- D. Gastrulation -> Fertilization -> Organogenesis -> Cleavage
Explanation
After gamete formation, the first process that occurs is fertilization, which means the fusion of gametes to form a zygote. Then this zygote divides which is termed as cleavage, then after that and before organogenesis, we have the gastrula stage. Hence option C is correct.
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About Growth and Development
Embryonic development covers fertilization, cleavage, formation of the blastula and gastrula, germ layers, organ formation and differentiation. Regeneration describes the replacement of lost tissues or body parts, whereas ageing involves gradual cellular and physiological changes linked to reduced repair, altered metabolism and declining organ function.
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