Question:
Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following must be true?
Twins are born to a family that lives next door to you. The twins are a boy and a girl. Which of the following must be true?
Show Hint
Different sexes = Fraternal twins. Same sex = Could be identical or fraternal.
Updated On: Mar 19, 2026
- They are fraternal twins.
- They were conceived through in vitro fertilization.
- They have 75\% identical genetic content.
- They are monozygotic twins.
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Monozygotic (identical) twins develop from a single fertilized egg that splits into two embryos. Since they originate from the same zygote, they are always the same sex. Dizygotic (fraternal) twins develop from two separate eggs fertilized by two different sperm. Because they are from separate zygotes, they can be different sexes and have different genetic makeup (like any siblings). A boy and a girl twin pair can only be fraternal twins. In vitro fertilization doesn't determine whether twins are monozygotic or dizygotic. 75\% genetic similarity is not a standard measure for twins.
Was this answer helpful?
9
0
Top NEET Biology Questions
- All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemakar?
- The blood calcium level is lowered by the deficiency of
- The 'blue baby' syndrome results from -
- The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of
- The breeding place of Flamingo (Hansawar) in India is most likely
View More Questions
Top NEET Genetics Questions
- Match List I with List II :Choose the correct answer from the options given below :
List - I Type of Inheritance List – II Example A. Incomplete dominance i. Blood groups in human B. Co-dominance ii. Flower colour in Antirrhinum C. Pleiotropy iii. Skin colour in human D. Polygenic inheritance iv. Phenylketonuria - Match List-I with List-II:Choose the correct answer from the options given below:
List-I List-II A. Histones III. Positively charged basic proteins B. Nucleosome IV. DNA wrapped around histone octamer C. Euchromatin I. Loosely packed chromatin D. Heterochromatin II. Densely packed Chromatin - Given below are two statements:
Statement I: Failure of segregation of chromatids during cell cycle resulting in the gain or loss of whole set of chromosome in an organism is known as aneuploidy.
Statement II: Failure of cytokinesis after anaphase stage of cell division results in the gain or loss of a chromosome is called polyploidy.
In the light of the above statements, choose the correct answer from the options given below: - Recombination between homologous chromosomes is completed by the end of
- Match List-I with List-II:Choose the correct answer from the options given below:
List-I List-II A. Metacentric chromosome I. Chromosome has a terminal centromere B. Sub-metacentric chromosome II. Middle centromere forming two equal arms of chromosome C. Acrocentric chromosome III. Centromere is slightly away from the middle of chromosome resulting into two unequal arms D. Telocentric chromosome IV. Centromere is situated close to its end forming one extremely short and one very long arm
View More Questions
Top NEET Questions
- A coil of inductive reactance $31\, \Omega$ has a resistance of 8 $\Omega$. It is placed in series with a condenser of capacitative reactance $25 \,\Omega$. The combination is connected to an a.c. source of 110 V. The power factor of the circuit is :-
- In an a.c. circuit with phase voltage V and current I, the power dissipated is
- A bubble in glass slab $ (\mu = 1.5) $ when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is
- A bulb is located on a wall. Its image is to be obtained on a parallel wall with the help of convex lens. If the distance between parallel walls is 'd' then required focal length of lens placed in between the walls is : -
- A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
View More Questions