Principle of Inheritance and VariationMedium
Question
Foetal sex can be deterined by examinig cells form the amniotic fluid by looking for
Options
A.Barr bodies
B.autosomes
C.chiasmata
D.kinetochore
Solution
Amniotic fluid contains living cells flaked off from the skin of baby or amnion (serived from zygote and identical 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). Since females have XX-chromosome presence of Barr body indicates female child while absence indicates male.
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