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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance1 Mark
MCQ
Genes located on Y-chromosome are:
  • A
    Mutant genes.
  • B
    Sex-linked genes.
  • C
    Autosomal genes.
  • D
    Holandric genes.
✓

Answer

  1. Holandric genes.

Explanation:

Sex-linked genes are the one which is located and inherited with sex chromosomes. Since both X and Y chromosomes serve as sex chromosomes in animals, sex-linked genes can be present on both X and Y chromosomes. Holandric genes are the sex-linked genes which are present on Y chromosome specific loci only and thus are transmitted from father to son. Any chromosome other than sex chromosome is referred to as autosome which controls normal traits of the organism and the genes present on autosomes are referred to as autosomal genes. Y chromosome is a sex chromosome. Any gene, both autosomal and sex-linked genes, that has undergone mutation obtains a mutant gene which in turn codes for mutant mRNA and thus mutant polypeptide.

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