MCQ

Описание: In this YouTube Shorts video, we discuss an important Biology MCQ related to twins and human genetics, which is frequently asked in NEET, CUET, SSC, UPSC, State PCS, Railway, and other competitive examinations. The question states that twins are born to a family next door and the twins consist of one boy and one girl. You are asked to identify which statement must be true.

This question mainly tests your understanding of types of twins, especially the difference between monozygotic (identical) twins and dizygotic (fraternal) twins. Many students get confused between these two, which is why such MCQs are commonly included in exams.

Monozygotic twins develop from a single fertilized ovum (zygote) that splits into two embryos. Since they originate from the same zygote, they have almost identical genetic material and are always of the same sex. Therefore, if twins are a boy and a girl, they cannot be monozygotic twins.

Fraternal twins, also known as dizygotic twins, are formed when two separate eggs are fertilized by two different sperms. As a result, they are genetically similar only to the extent of normal siblings and can be of same or different sex. Hence, when twins are one boy and one girl, the only correct conclusion is that they are fraternal twins.

This short video provides quick conceptual clarity, helps in option elimination, and strengthens your exam-solving skills. It is perfect for last-minute revision, daily MCQ practice, and biology concept strengthening.

Content Table:

Introduction to the MCQ

Types of Twins

Monozygotic Twins Explained

Fraternal Twins Explained

Why Other Options Are Incorrect

Final Answer & Exam Tip


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