Topic 14-1

Question 1

heterozygote phenotype is intermediate between two homozygote phenotypes

Answer 1

incomplete (or semi) dominance

Question 2

a 1:2:1 ratio of traits indicates

Answer 2

incomplete dominance

Question 3

polydactyly (extra fingers/toes) is caused by a dominant allele (Px) where:

Answer 3

P+ is the normal allele and extra finger/toes are found only in P+Px (heterozygous) cats

Question 4

the percentage of organisms having a particular genotype that express a phenotype

Answer 4

penetrance

Question 5

polydactyly is an example of:

Answer 5

incomplete penetrance of a dominant allele

Question 6

interaction between the effects of genes at different loci

Answer 6

gene interaction