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LAWS OF HEREDITY - Coggle Diagram
LAWS OF HEREDITY
RECESSIVE
odds are greater if parents are related
intermarriage among relatives = more likely in isolated communites
must be passed from both mother and father
same genes
DOMINANT
pattern of genetic transmission is dominant
every generation is likely to have deaf children
a gene effectively overrules the other
BROWN FAMILY OF HENNIKER
dominant genes
1/2 of family members were born hearing
1/2 of family members were born deaf
all deaf members of the family had a deaf parents
all deaf members who married had at least 1 deaf child
MAYHEW, TILTON, LAMBERT & SKIFFE FAMILES OF MARTHA'S VINEYARD
recessive genes
will possess the critical gene and yet not be deaf themselves
both parents have the gene = 1/4 of children will be deaf
if 1 parent has the gene = 0 children will be deaf
still carry the deaf gene
many deaf children had hearing parents
1 deaf spouse + 1 hearing spouse = no deaf children