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STD 12 - 4. principal of inheritance and variation — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 4. principal of inheritance and variation1 Mark
MCQ
Study the pedigree chart given below. What does it show?
  • ✓
    Inheritance of a condition like phenylketonuria as an autosomal recessive trait.
  • B
    The pedigree chart is wrong as this is not possible.
  • C
    Inheritance of a recessive sex­linked disease like haemophilia.
  • D
    Inheritance of a sex­linked inborn error of metabolism like phenylketonuria.
✓

Answer

Correct option: A.
Inheritance of a condition like phenylketonuria as an autosomal recessive trait.
a
(a) : This chart shows inheritance ofan autosomal recessive trait like phenylketonuria. An autosomal recessive trait may skip a generation. It appears in case of marriage between two heterozygous individuals $(Aa × Aa = 3\ Aa + 1\ aa)$, a recessive individual with hybrid $(Aa × aa = 2\ Aa + 2\ aa)$ and two recessive $(aa× aa = all\ aa)$. Phenylketonuria is an inborn, autosomal, recessive metabolic disorder in which homozygous recessive individual lacks the enzyme phenylalanine hydroxylase. The heterozygous individuals are normal but carriers.

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