Formative Practice 15.5 (Form 4 Biology Textbook Exercise and Answer)


Question 1:
State two differences between identical and fraternal twins.

Answer:
• The genetic constitution and physical characteristics of identical twins are similar whereas for fraternal twins, they are different.

• The sex of identical twins is the same but may be different for fraternal twins.


Question 2:
State the characteristics of conjoined twins.

Answer:
The physical part of Siamese twins is still joined together, usually at the chest, abdomen or pelvis (buttocks). They may also share one or two internal organs.

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