The Gene Pool

Alzheimer's is the most common form of dementia. This may end in severe memory loss and can even cause death. In the early stages, memory loss is mild, but with late-stage Alzheimer's, individuals lose the ability to carry on a conversation and respond to their environment. Although there are no current treatments that can stop Alzheimer's, some will slow the progress of its symptoms.

 

Genotype: APOE4

Phenotype: brain decay

Homozygous v. Heterozygous:

Dominant v. Recessive:

Allele: APOE e4

Trait: brain decay, memory loss

Gene: APP, PSEN1, or PSEN2

Punnett Square:

Pedigree:

Inheritance Pattern: autosomal dominant pattern

Polygenic inheritance:

Incomplete Dominance:

Codominance:

Multiple Alleles: e4, APOE

Environmental Factors: aging makes the disease worse