Biological termHard0.5 marks
6(b)
Give appropriate biological / technical terms for the following:
The kind of twins formed from two fertilised eggs.
Topic: Fraternal twins
Previous-year question practice database
Answer
Exam answer
FRATERNAL (non-identical or dizygotic) TWINS.
Explanation
FRATERNAL twins arise when TWO ova are released and each is fertilised by a DIFFERENT sperm. They are genetically no more alike than ordinary brothers and sisters, and may be of different sexes.
IDENTICAL (monozygotic) twins arise from ONE fertilised egg that splits into two after fertilisation. They have exactly the same genes, are always of the SAME sex, and look alike.
The prefixes carry it: DI- means two (two zygotes), MONO- means one (one zygote). Reading the word answers the question.
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