Dirty condenser coils, evaporator fan motor failure or a defective start relay switch are common freezer problems that cause the freezer to malfunction or not freeze. Frosted-over evaporator coils, a...
A pedigree is a table or chart recording a line of ancestors , either of persons or ( more especially ) of animals , as horses , cattle , and dogs ; in the case of animals , such a table is used as proof of superior qualities : a detailed pedigree.A genealogy is an account of the descent of a person or family traced through a series of generations , ...
Pedigrees are used to help detect many different genetic diseases. A pedigree can also be used to help determine the chances for a parent to produce an offspring with a specific trait. Four different traits can be identified by pedigree chart analysis: autosomal dominant, autosomal recessive, x-linked, or y-linked. Partial penetrance can be shown and calculated from pedigrees. Penetrance is the percentage expressed frequency with which individuals of a given genotype manifest at least some degree of a specific mutant phenotype associated with a trait.