Microcephaly, the small sized skull is due to:
Correct answer: D. Genetic Defect
- A. Nutritional Cause
- B. Hormonal Causes
- C. Skeleton Damage
- D. Genetic Defect
Explanation
Explanation: Microcephaly, the small-sized skull, is usually due to a genetic defect. It can also be caused by environmental factors such as infections, exposure to toxic substances, and lack of proper nutrition during fetal development, but genetic causes are the most common. Genetic causes may include mutations in genes involved in brain development, chromosomal abnormalities, or inherited conditions that affect brain growth.
This question appeared on the UHS MDCAT 2009 paper, which you can sit online with every answer explained.
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About Embryonic Development
Embryonic development begins after fertilization with cleavage and formation of the morula and blastula, followed by gastrulation and the establishment of germ layers. It includes organ formation, tissue differentiation and early growth, rather than the later increase in size associated with postnatal development.
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