IMED2004 Study Guide - Final Guide: Penetrance, Capsicum, Epistasis
Document Summary
Polydactyly is usually caused by a dominant allele. Q has passed dominant allele to two children. Phenotype is incomplete in expressivity and penetrance. Is thus the percentage of individuals having a specific genotype which express the expected phenotype. So, if have 50 people with the allele for polydactyly. Then the penetrance is 41/50 = 82%. Is the degree to which a character is expressed. Some people have extra fully functional digits, others do not. No complete extra digits but partial (picture) Incomplete penetrance & variable expressivity are due to. And environmental factors that alter or suppress the effect of a gene. Percentage of individuals having a particular genotype that express the expected phenotype. The degree to which a character is expressed. Gene interaction occurs when genes at multiple loci determine a single. Effects of genes at one locus depend on the presence of genes at other loci. The products of genes at different loci combine.
