Microcephaly, the small sized skull is due to:
Correct answer: D. Genetic defects
- A. Nutritional causes
- B. Skeletal causes
- C. Hormonal causes
- D. Genetic defects
Explanation
Microcephaly is a condition where the head (circumference) is smaller than normal. Microcephaly may be caused by genetic abnormalities. Genetic mutations in various genes can disrupt brain development and cause microcephaly. Some well-known genetic syndromes associated with microcephaly include Down syndrome, Apert syndrome, and Seckel syndrome.
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Embryonic development covers fertilization, cleavage, formation of the blastula and gastrula, germ layers, organ formation and differentiation. Regeneration describes the replacement of lost tissues or body parts, whereas ageing involves gradual cellular and physiological changes linked to reduced repair, altered metabolism and declining organ function.
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