Question

part 1 Which of the following can result from environmental effects (e.g., temperature) on the way the genotype is expressed?

Group of answer choices

a Variable expressivity

b Epistasis

c Complementation

d Genomic imprinting

Part 2 Which of the following is a question that you would use a complementation test to answer?

Group of answer choices

a Is acorn color in oak trees controlled by more than one gene?

b Are dark feathers dominant to white feathers in penguins?

c Is tail shape a sex-linked trait in peacocks?

d Does phenotype depend on whether an allele was inherited from the female or male parent?

Answer 1

Part 1 - a, variable expressivity

Variable expressivity is the range or degree of symptoms and severity occurs in different people with the same genetic conditions. With reduced penetrance, the expressity is probably caused by a combination of environmental factors, genetic factors, and lifestyles.

Epistasis occurrs when 1 gene locus masks or modifies the phenotype of a second gene locus. Complementation produce the same mutant phenotype and it occurs only if the mutations are present in different genes, whereas genomic imprinting is an epigenetic inheritance that causes the genes to be expressed in relation to the sex of the transmitting parent.