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Spina bifida doesn't follow a strict inheritance pattern, but hereditary factors do play some role, though it is not completely understood yet.
Mothers who have had one child with spina bifida have a 3-4% chance of their next child having spina bifida, while the general population only has a 0.1-0.2% chance. In the case a pregnant woman has a family history of spina bifida, it is recommended that they take a higher dose of folic acid than other pregnant women. Here again, folic acid plays a role in preventing neural tube defects (like spina bifida), but the mechanism is not well understood.
Also, for an unknown reason, it is more prevalent in female children than in male children.
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What is the name given to the weaker trait that can be covered up by the dominant trai?
The weaker trait that can be covered up by the dominant trait is called a recessive trait. It is only expressed when an individual has two copies of the recessive allele.
If an offspring receives a pair of trait-controllers containing both a dominant and a recessive trait what happens to the recessive trait?
The dominant trait is shown in that organism with the possibility of carrying either the dominant or recessive gene to the next generation
Why are two recessive alleles needed for a recesssive trait to be shown?
Two recessive alleles are needed for a recessive trait to be shown because a recessive trait is only expressed when an individual has two copies of the recessive allele (one from each parent). If an individual has one dominant allele, it will mask the expression of the recessive allele, resulting in the dominant trait being displayed.
Is the trait for bleeder's disease dominant or recessive?
Recessive
Why wouldn't you see a recessive trait?
You wouldn't see a recessive trait if an individual has one dominant and one recessive allele for that trait. In this case, the dominant allele's phenotype will be expressed, masking the recessive trait. The recessive trait would only be visible if an individual has two copies of the recessive allele.
