A) Klinefelter's syndrome?44 autosomes + XXY
B) Colourblindness ? Y-linked
C) Erythroblastosis foetalis? X-linked
D) Down syndrome?44 autosomes + XO
Correct Answer: A
Solution :
Klinefelter's syndrome is represented by 44 autosomes + XXY. When an abnormal egg with XX chromosome is fertilized by a sperm carrying Y-chromosome a zygote having XXY sex chromosomes is formed. The resulting young one is an abnormal sterile male. The 44 autosome + XO condition is due to Turner's syndrome. Such females are sterile and have short stature, webbed neck, broad shield-shaped chest etc. Down's syndrome is due to trisomy of 21st pair of chromosome. It is characterised by moderate mental retardation, large tongue, short stature, stubby fingers, an enlarged liver and spleen. Colourblindness is an X-linked disease. The person suffering from this disease cannot differentiate between red and green colours. Erythrobalstosis-foetalis is caused due to Rh factor in child of \[R{{h}^{+}}\] man and \[R{{h}^{-}}\] woman.
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