DC Biology-Complex Inheritance Quiz

Incomplete dominance:

Trait is blended due to neither allele covering the other

In incomplete dominance, _____________ shows an intermediate, blended phenotype

Heterozygous

Codominance/multiple alleles:

Two alleles affect the phenotype equally and separately (not blended)

Most genes are ___________

Pleiotropic

Pleiotropic:

One gene affects more than one phenotypic character

Epistasis:

One gene completely masks another gene

Some genes are ______ when both alleles are present

Lethal

Polygenic inheritance:

Individual heritable characters are often found to be controlled by groups of several genes (polygenes)

Quantitative inheritance:

Variations are continuous or quanitative

Phenotype is controlled both by ________ and _________

Environment; genes

Phenotypic plasticity:

When individuals with the same genotype exhibit different phenotypes in different enviorments

X linked genes:

Genes located on X chromosome inherited with that X; females are carriers but males receive only one copy of gene

Monohybrid cross:

Single trait is examined

Dihybrid cross:

Two traits are examined

What do pedigrees measure?

Inheritance of one trait in several biologically related individuals spanning multiple generations