According to a source, the answers are trait may not occur within every generation of a family, the parents of children who have this trait may not be themselves affected.
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Parents that are not affected (but heterozygous) for the inheritance can produce affected kids.
Recessive inheritance are not expressed in every generation in a pedigree.
Autosomal recessive inheritance have equal chance of being expressed in both male and female in a pedigree.
Explanation:
Recessive inheritance or traits are those that can be phenotypically expressed only if two copies of the recessive alleles are present in an organism. The characteristics of recessive inheritance include:
Parents that are not affected (but heterozygous) for the inheritance can produce affected kids.
Recessive inheritance are not expressed in every generation in a pedigree.
Autosomal recessive inheritance have equal chance of being expressed in both male and female in a pedigree.
Insertions are mutations in which extra base pairs are inserted into a new place in the DNA. Deletions are mutations in which a section of DNA is lost, or deleted.
The answer is basically that having nerve cells reproduce can do more harm than good. Each nerve cell has a specific place in our nervous system. ... Adding new nerve cells would mess up these very specific connections in a very complex system.
