Patterns of inheritance-Kerrigan

What is incomplete dominance?

• When both alleles are fully expressed in the phenotype

• When one allele completely masks the other

• When the heterozygote shows a blend of both parental traits

• When a single gene affects multiple traits

Which of the following is an example of incomplete dominance?

• Blood type AB in humans

• Pink flowers from red and white snapdragon parents

• Brown eyes from brown and blue-eyed parents

• Sickle cell anemia

In incomplete dominance, what phenotype is observed in the heterozygote?

• Only the dominant trait

• Only the recessive trait

• A mixture or intermediate of both traits

• Both traits appear separately

Which term describes a trait controlled by multiple genes?

• Codominance

• Polygenetics

• Pleiotropy

• Incomplete dominance

What shape does the distribution of polygenic traits often form in a population?

• Linear

• Bell curve

• Zigzag

• Square

Why does a bell curve form for polygenic traits in a large population?

• Because only two phenotypes are possible

• Because multiple genes contribute small effects, creating many intermediate phenotypes

• Because one gene controls the trait

• Because of codominance

• Codominance

• Incomplete dominance

• Complete dominance

• Polygenic inheritance

Which of the following best explains why human height shows a continuous range of values?

• It is controlled by a single gene

• It is influenced by codominance

• It is a polygenic trait

• It is an example of incomplete dominance

Tags

NGSS.HS-LS3-3

• 25%

• 50%

• 75%

• 100%

Tags

NGSS.HS-LS3-3

In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). Match the following genotypes to their phenotypes

• White feathers

• WW

• Black feathers

• BW

• Erminette (Black and white feathers)

• BB

Tags

NGSS.HS-LS3-1