Barr body in mammals represents

  • [AIPMT 1995]
  • A

    All the heterochromatin in female cells

  • B

    One of the two $X$ chromosomes in somatic cells of females

  • C

    All the heterochromatin in male and female cells

  • D

    The $Y$ chromosome in somatic cells of male

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Alleles which show independent effect are called

  • [AIPMT 1996]

The mule is a

Meta-females have

Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino

  • [AIPMT 1998]

Improvement of genetic characters and present day generation on the basis of best nutrition and training is called