Question

Usually, the recessive character is expressed only when present in double recessive condition. However, a single recessive gene can express itself in human beings when the gene is present on:

• A.
  Any autosome
• B.
  X chromosome of female
• C.
  X chromosome of male
• D.
  Either on autosome or X chromosome

Answer 1

The correct option is C

X chromosome of male
Human males are heterozygous in nature. Thus, on Y chromosome there are no genes; only X chromosome carries genes. If recessive gene is present on X chromosome, the person will be affected by the disease.