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Introduction to Natural Selection Natural selection posits that only a certain percentage of offspring born will survive to reproduce another generation. Individuals with certain genotypes will be more likely to survive, mate, and reproduce their genotypes in subsequent generations. Thus, natural selection acts upon individuals, whereas evolution occurs at the level of a population. There are [...] Species- a natural group that shares a distinct form Onset & Symptoms: Personality changes Treatments: Nothing known to slow or stop the decline Prevalence: 1 in 20,000 people Famous People with the Disease: Woody Guthrie Heritability & Environmental Factors: Caused by a dominant allele Individuals with Huntington’s Disease have one dominant Huntington’s allele and one normal allele. It is [...] Onset & Symtoms: Mental retardation Treatments: Specialized low-phenylalanine diet Prevalence: 1 in 10,000 people Famous People with the Disease: Unknown Heritability & Environmental Factors: Caused by a recessive allele PKU is caused by a recessive allele, meaning an individual must inherit two copies of the allele, one from each parent, in order [...] P generation – the “Parent” generation; the point of reference on which Mendelian predictions are based. Similar to an “index case” in a pedigree. |
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