A unit of heredity with two or more different forms (usually dominant and recessive) is known as
A: an allele.
B: a genotype.
C: a phenotype.
D: a gene.
A: an allele.
B: a genotype.
C: a phenotype.
D: a gene.
举一反三
- A heritable trait with two different forms (dominant and recessive) is known as A: an allele. B: a genotype. C: a phenotype. D: a gene.
- The physical expression of an organism's genes is known as A: genotype. B: heterozygote. C: phenotype. D: independent assortment.
- A________ trait is opposed to a recessive trait which is expressed only when two copies of the gene are present. A: determinant B: dormitory C: dominant D: dormant
- In codominance, heterozygote (Aa) has an intermediate phenotype between the dominant homozygote (AA) and recessive homozygote (aa).
- It is difficult to distinguish the physiological races in morphology, usually relying on ( ) to distinguish them. A: differential hosts B: phenotype C: genotype D: pathogenicity