Biology
During the metaphase and anaphse stages of cell division,each chromosome comprises of two unseparated replicas known as the

Plastids
Chiasmata
Chromatids
Tetrads

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Biology
In test tube baby

Development of ova take place in test tube without fertilization
Fertilization of ova and development takes place in test tube
Fertilization takes place in uterus while development takes place in test tube
Fertilization of ova takes place in test tube which development of embryo occur in uterus

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