Which severe brain malformation is primarily linked to multifactorial inheritance?

• A. Anencephaly
• B. Pyloric stenosis
• C. Congenital heart disease
• D. Functioning corpus luteum

Answer: (A)

The correct choice, anencephaly, is primarily associated with multifactorial inheritance due to the combination of genetic and environmental factors that contribute to its development. Anencephaly is a serious congenital condition where a significant portion of the brain, skull, and scalp is missing. Multiple genes, along with maternal health factors, nutritional status (particularly folic acid levels), and environmental exposures, can influence the risk of this malformation.

Multifactorial inheritance suggests that both genetic predispositions and non-genetic influences come together to affect the outcome. This complexity is characteristic of many central nervous system malformations, reflecting the interaction of various risk factors rather than a single genetic anomaly.

Other options, while they may also have multifactorial components, do not primarily represent brain malformations in the same way that anencephaly does. For instance, pyloric stenosis is often more closely associated with genetic factors but can also occur more frequently in certain familial patterns. Congenital heart disease has a broad spectrum and can also arise from both genetic and environmental influences, but the link to multifactorial inheritance is more indirect compared to anencephaly. Functioning corpus luteum does not relate to brain malformation and instead pertains to ovarian function