Question

The appearance of a recessive phenotype due to deletion of dominant gene is called_______________

(a) Hemi-dominance

(b) Pseudo dominance

(c) Imperfect dominance

(d) Co-dominance

I have been asked this question during an online interview.

This interesting question is from Chromosomal Abnormalities : Deletion in section Chromosomal Basis of Inheritance of Cytogenetics

Answer 1

The correct choice is (b) Pseudo dominance

For explanation: Pseudo dominance is the condition when the recessive allele is expressed in deletion mutation of dominant. Hemi-dominance is the condition when only one copy of the gene is supposed to be present, as in genes of Y chromosomes. Co-dominance and imperfect dominance are different.