5. Which of the following is NOT true about a recessive gene trait?
A. It is expressed when the genotype is heterozygous.
B. It can be masked by a dominant gene trait.
C. It is expressed only when a dominant gene isn't present.
D. It can be expressed when the genotype is homozygous.

A. It is expressed when the genotype is heterozygous.

Explanation:

Gene is only expressed in homozygous recessive.

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.