Which of the following is the significance of dominance?

  • A
    Organisms with dominant genes are more biologically fit.
  • B
    Harmful mutations are not expressed due to the presence of dominant genes.
  • C
    Heterosis is observed due to dominant genes.
  • D
    All of the above.

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$(iii)$ Mentally retarded.
$(iv)$ Haemoglobin is not formed in the proper amount in the blood.

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