When Can Erythroblastosis Fetalis Not Possibly Happen in the Child

question 85

Multiple Choice

When can erythroblastosis fetalis not possibly happen in the child of an Rh negative mother?

• A) if the child is type O positive
• B) if the child is Rh⁺
• C) if the father is Rh⁺
• D) if the father is Rh⁻

---

Definitions:

Pleiotropy

A genetic phenomenon in which a single gene influences multiple phenotypic traits in an organism.

Polygenic Inheritance

A type of genetic inheritance where multiple genes determine a trait, resulting in a continuous range of possibilities.

Incomplete Dominance

Incomplete dominance is a genetic situation in which neither allele is dominant, resulting in an offspring with a phenotype that is a blend of the parental traits.

Codominance

A genetic scenario where two alleles are both expressed equally in the phenotype of the heterozygote, instead of one being dominant over the other.