Question

Genetics:

Can someone explain how pseudo dominance is presented in a pedigree? (I am a visual learner) Will give a thumbs up.

Answer 1

Pseudo dominance is the phenomenon in which a recessive gene expresses itself even when it is present alone, that means mimics the dominant behaviour.

This case is particularly observed in sex linked recessive gene expression in which male shows the effect of x linked recessive gene as only one x chromosome is present.

Same observation can also be made when an autosomal allele gets deleted due to mutations then its recessive counterpart starts to express itself. Example ectrodactyly with aplasia