An ovary releases an egg every month. When two babies are produced in succession, they are called twins. Generally, twins are produced from a single egg by the separation of early blastomeres resulting from the first zygotic cleavage. As a result, the young ones formed will have the same genetic make- up and are thus, called identical twins.
If the twins born are fraternal, then they would have developed from two separate eggs. This happens when two eggs (one from each ovary) are released at the same time and get fertilized by two separate sperms. Hence, the young ones developed will have separate genes and are therefore, called non-identical or fraternal twins.
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This question is based on core NCERT concepts explained in the chapter and should be revised thoroughly before exams.
An ovary releases an egg every month. When two babies are produced in succession, they are called twins. Generally, twins are produced from a single egg by the separation of early blastomeres resulting from the first zyg...
Step-by-step explanation:
• An ovary releases an egg every month
• When two babies are produced in succession, they are called twins
• Generally, twins are produced from a single egg by the separation of early blastomeres resulting from the first zygotic cleavage
• As a result, the young ones formed will have the same genetic make- up and are thus, called identical twins
•
Students often lose marks by skipping steps, writing incomplete explanations, or misunderstanding keywords used in the question.
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