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17.3 Pedigree Analysis of Human Traits
There are two types of disorders, dominantly inherited disorders and recessively inherited disorders.
For ethical and practical reasons, female cists cannot use this approach.
Male mation from family trees is what human geneticists need to rely on.
The small Affected individual size of human families may lead to large sampling errors, so the results of this method may be less definitive than the results of breeding experiments.
A pedigree analysis can provide important clues about Presumed Heterozygote.
There is a rare allele that has arisen.
Members of the family are affected with a disease.
It is possible to determine whether a person is a carrier or a dominant one with the help of genealogy analysis.
Suppose a genetic disease is caused by a sister.
Approximately 3% of Americans are carriers of the same disease as the offspring of two affected individuals.
The symptoms of genetic diseases that limit survival or fertility include abnormality of rare cases where two affected individuals produce offspring.
Hun the Roman numeral I is at the top with later generations of tington disease, a condition that causes the loss of brain below it.
A male and a female are represented by squares.
The symptoms of a circle are connected by a horizontal line and the symptoms of a Huntington disease are connected by a vertical line.
Siblings are placed on downward projections from a single hor the limbs, trunk, and face, with progressive loss of mental abilities, and izontal line, from left to right.
One affected parent is an individual affected by the disease.
The pattern depicted by filled symbols is characteristic of most dominant individual II 3.
Why does this show a pattern of inheri offspring?
The answer is that two unaffected individuals can nondisease-causing allele to his offspring.
The individuals are presumed to have fected offspring.
There are auto two copies of the same genes that show the disease, because an individual must inherit tance patterns involving these genes.
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