In human female, barr bodies are formed by

  • [AIPMT 1996]
  • A

    Inactivation of mother's $X$ chromosome

  • B

    Inactivation of father's $X$ chromosome

  • C

    Inactivation of both mother's and father's $X$ chromosomes

  • D

    Inactivation of either mother's or father's $X$ chromosome

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Mirabilis jalapa is a good example of

  • [AIIMS 2001]

The evidence that crossing over occurs at four stranded stage and not at two stranded stage of the chromosomes, comes from

Match the columns :

Column $I$
 
Column $II$
 
$(1)$ Lethal mutation $(a)$ Mutation caused by
external factors
$(2)$ Spontaneous mutation $(b)$ They are metabolic
errors
$(3)$ Induced mutation $(c)$ As a result the
mutant dies
$(4)$ Biochemical mutation $(d)$ Most of the
mutations occurs in
nature are of this
type.
 

 

If in a child of $10$ years ages of the intelligence is of $14$ years child, the $I.Q.$ of this child would be

A recessive mutant is one which