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Foetal sex can be determined by examinin...

Foetal sex can be determined by examining cells from the amniotic fluid by looking for

A

Barr bodies

B

autosomes

C

chiasmata

D

kinetochore

Text Solution

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The correct Answer is:
A
Females have XX-chromosome, presence of Barr body indicates female child while absence indicates male. Amniotic fluid contains living cells flaked off from the skin of baby or amnion (derived from zygote and indentical to foetus cells).
The non-dividing cells are examined. One X-chromosome always appears in the active state. If another is present, it is seen in a resting state as tightly coiled dark staining body (Barr body).
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