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JAMB Biology 1979 Question 39

Question 39

Mendelian Inheritance

Identical twins are produced under one of the following conditions:

  1. A.Two ova fertilized at the same time by two sperms
  2. B.One ovum fertilized, divides to give two embryos
  3. C.One ovum fertilized, twins formed shortly before birth
  4. D.Two ova fertilized by one sperm
  5. E.One ovum fertilized by two sperms.
Show the answer and explanation

Answer: B (One ovum fertilized, divides to give two embryos)

Explanation

Identical twins come from one zygote that splits into two embryos, so they share the same genes.