Identical twins are produced under one of the following conditions
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Correct Answer: Option B
Explanation:
Identical twins (monozygotic twins) are produced when a single fertilized ovum (egg) divides into two embryos during early development. These embryos share the same genetic material, making them genetically identical.
Here's a breakdown of the other options:
A. Two ova fertilized at the same time by two sperm – This results in fraternal twins (dizygotic twins), not identical twins. The two eggs are fertilized by two different sperm and develop into two genetically different embryos.
C. One ovum fertilized, twins formed shortly before birth – This statement is not accurate in describing the process of identical twins, which occurs when the fertilized egg divides early in development, not just before birth.
D. Two ova fertilized by one sperm – This is not possible. Each egg must be fertilized by one sperm.
E. One ovum fertilized by two sperm – This is a rare and abnormal occurrence called polyspermy, which typically results in an embryo that cannot develop properly, not twins.
Identical twins (monozygotic twins) are produced when a single fertilized ovum (egg) divides into two embryos during early development. These embryos share the same genetic material, making them genetically identical.
Here's a breakdown of the other options:
A. Two ova fertilized at the same time by two sperm – This results in fraternal twins (dizygotic twins), not identical twins. The two eggs are fertilized by two different sperm and develop into two genetically different embryos.
C. One ovum fertilized, twins formed shortly before birth – This statement is not accurate in describing the process of identical twins, which occurs when the fertilized egg divides early in development, not just before birth.
D. Two ova fertilized by one sperm – This is not possible. Each egg must be fertilized by one sperm.
E. One ovum fertilized by two sperm – This is a rare and abnormal occurrence called polyspermy, which typically results in an embryo that cannot develop properly, not twins.