Principle of Inheritance and VariationEasyBloom L3
Question
The syndrome in which individual somatic cell contains three sex chromosomes XXX is called
Options
A.Klinefelter's syndrome
B.Turner syndrome
C.Down's syndrome
D.Super female
Solution
Sol.(d) [Key Concept: XXX Syndrome — Superfemale (Metafemale)] An individual whose somatic cells contain THREE sex chromosomes (47,XXX) is called a SUPERFEMALE or METAFEMALE. These individuals are female in phenotype, usually fertile, and may appear normal but may have mild intellectual disability. Klinefelter's syndrome = 47,XXY (male); Turner syndrome = 45,XO (female); Down's syndrome = 47,+21 (trisomy 21). The XXX condition results from non-disjunction of X chromosomes.
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