While counselling a couple regarding the likelihood that their child will inherit a certain genetic disorder, you explain that some genotypes do not always express their corresponding phenotype while other genotypes are always expressed. What concept are you explaining?

Question

Quizplus · Accepted Answer

Penetrance is the probability to which a genotype will be phenotypically expressed. Traits with full penetrance will be expressed in all patients of that genotype. With incomplete penetrance, the disease is not expressed in all patients of that genotype. Answer A is incorrect because cytogenetics is using light microscopy to study chromosomes. Answer B is incorrect because variable expressivity refers to differences in the clinical or phenotypical presentation of a disease. Answer C is incorrect because dominance is the ability of a trait to manifest itself in heterozygous carriers. Thus, answer D is the correct choice.

While Counselling a Couple Regarding the Likelihood That Their Child