Non-Mendelian Inheritance

What is codominance in genetics?

• When one allele completely masks another allele

• When both alleles are expressed simultaneously

• When only recessive alleles are expressed

• When an intermediate phenotype is shown

If a chicken has both black and white feathers, what type of inheritance is demonstrated?

• Incomplete dominance

• Lethal alleles

• Codominance

• Polygenic inheritance

What is incomplete dominance?

• When one allele completely masks the other

• When an intermediate phenotype appears between two homozygous phenotypes

• When only dominant alleles are expressed

• When alleles are lethal

When a white rose and a red rose are crossed and produce pink flowers, what type of inheritance is this?

• Codominance

• Lethal alleles

• Incomplete dominance

• Multiple alleles

Multiple alleles mean that a gene in a population has:

• Only one allele present

• More than two alleles

• Exactly two alleles

• No alleles

Tags

NGSS.HS-LS3-3

Which example illustrates multiple alleles?

• Blood types in humans (A, B, O)

• Height controlled by several genes

• A single gene with two alleles

• Color-blindness

What is polygenic inheritance?

• When multiple genes control a trait

• When only one gene controls a trait

• When all alleles are lethal

• When a gene has only two alleles

Tags

NGSS.HS-LS3-3

Which of the following traits in humans is controlled by polygenic inheritance?

• Blood type

• Hair color

• Color blindness

• Marfan syndrome

What is pleiotropy in genetics?

• A single gene affecting multiple traits

• When one trait is controlled by multiple genes

• When alleles are lethal

• When genes are co-expressed

Which condition is an example of pleiotropy?

• Blood type in humans

• Marfan syndrome affecting height, limbs, and cardiovascular health

• Height in humans

• Eye color