SOAL UM-PTKIN Bahasa Inggris No. 58
When we think of twins, we usually think of identical twins. Identical twins are bom together, they are of the same sex, and they look exactly the same. In fact, they look so much the same that people often have difficulty telling them apart. However, not all twins are identical twins. Fraternal twins, like identical twins, are born together, but they are not always of the same sex and they do not look exactly the same. Sometimes the only way to tell fratemal twins from other brothers and sisters is to find out their birth dates. Identical twins look exactly the same because they are formed from the same egg, or zygote. Thus, identical twins are also known as monozygotic twins (mono=one, zygote=egg). Because they are formed from the same egg, monozygotic twins have the same genetic characteristics.
Fraternal twins, on the other hand, are formed from separate eggs, so they are called dizygotic twins (di=two). They corne from different eggs, so their genetic characteristics are different.
Because they did not understand how twins are formed, people in the past were afraid of twins. In some societies, twins babies were killed or left for wild animals to eat. According to one legend, the city of Rome was founded by twin brothers who were left to die but were brought up by a wolf.
58. The best definition of the word ‘identical’ is …
(A) Different sex and the same egg
(B) the same date of birth and different sex
(C) the same zygote and the same sex
(D) different egg and the same sex
(E) the same face and diffferent date of birth
JAWABAN DAN PEMABAHASAN
58. Jawaban: C (the same zygote and the same sex)
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