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

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

• 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.

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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