反动的 A: reactive B: reactionary C: reactional D: recessive

中国大学MOOC: Recessive alleles form no gene products, and thus are not expressed.

Recessive alleles form no gene products, and thus are not expressed. A: 正确 B: 错误

In codominance, heterozygote (Aa) has an intermediate phenotype between the dominant homozygote (AA) and recessive homozygote (aa).

What is the inheritance pattern for Huntington chorea? A: Mitochondrial disease B: Autosomal recessive C: Autosomal dominant D: X-linked

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.

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.

If the trait transferred from the donor parent to the reincarnation parent is controlled by the recessive single gene, then the selection of the backcross progeny is required ( ) to separate the trait for easy selection.

In human, color blindness is caused by sex linked recessive genes, while blue eye is caused by autosomal recessive genes. A blue eyed woman whose father is color blind marries a brown eyed man whose mother is blue eyed. How many of their sons are blue eyed? ( ) A: 1/2 B: 1/3 C: 1/4 D: 3/4

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