Biology Inheritance / Variation & Genetics MDCAT 2015
PMDC Verified Question 94 of 94
X-linked recessive trait is:
A
Hypophosphatemia
B
Haemophilia
C
Vitamin-D resistant rickets
D
Diabetes mellitus
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Haemophilia
Concept:

Different genetic disorders are mapped to specific inheritance patterns on sex chromosomes or autosomes.

Solution:

  • Haemophilia (along with color blindness) is a classic example of an X-linked recessive trait.
  • It primarily affects males because they possess only one X chromosome; a single recessive allele will cause the disorder.


Why other options are incorrect:

  • Hypophosphatemia (Vitamin-D resistant rickets): This is an X-linked dominant disorder.
  • Diabetes mellitus: Typically has multifactorial inheritance heavily involving autosomal traits and environmental factors.

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