Incomplete Dominance

What is incomplete dominance?

• An inheritance pattern where two alleles blend to create a new phenotype.

• An inheritance pattern where one allele is dominant to the other.

• An inheritance pattern where two alleles are expressed equally.

• An inheritance pattern where no alleles are expressed.

Give an example of incomplete dominance in humans.

• Human blood type

• Type AB blood

• Wavy hair

• Spotted coat color

Define genotype and phenotype.

• Genotype refers to the genetic makeup, while phenotype refers to the physical expression of traits.

• Genotype refers to the physical expression of traits, while phenotype refers to the genetic makeup.

• Genotype and phenotype are synonymous terms.

• Genotype refers to the traits inherited from the maternal parent, while phenotype refers to those inherited from the paternal parent.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Provide an example of incomplete dominance in animals.

• Wavy hair in humans

• Tay-Sachs disease

• Coat color in horses

• Human blood type

How does incomplete dominance differ from codominance?

• In incomplete dominance, both alleles are expressed equally, while in codominance, two alleles blend together.

• In incomplete dominance, one allele is dominant to the other, while in codominance, both alleles are expressed evenly.

• In incomplete dominance, neither allele is dominant, while in codominance, both are expressed

• In incomplete dominance, no alleles are expressed, while in codominance, both alleles are recessive.

How can incomplete dominance be recognized?

• By examining the phenotype of heterozygous organisms.

• By examining the genotype of heterozygous organisms.

• By using Punnett squares to predict offspring ratios.

• By observing the expression of recessive alleles.

What is the purpose of a Punnett square?

• To predict the possible genotypes and phenotypes of offspring from a genetic cross.

• To determine the dominance or recessiveness of alleles.

• To calculate the probability of specific traits occurring in a population.

• To identify carriers of genetic disorders.

Define the term "carrier" in genetics and provide an example.

• A carrier is an individual who carries a dominant allele for a genetic disorder but does not express the associated phenotype. Example: Tay-Sachs carrier.

• A carrier is an individual who carries a recessive allele for a genetic disorder but does not express the associated phenotype. Example: Sickle cell anemia carrier.

• A carrier is an individual who carries both dominant and recessive alleles for a genetic disorder. Example: Human blood type carrier.

• A carrier is an individual who carries an incomplete allele for a genetic disorder but does not express the associated phenotype. Example: Wavy hair carrier.

What does the 1:2:1 phenotype ratio signify in incomplete dominance?

• It indicates that the majority of offspring will exhibit the blended phenotype resulting from the combination of two alleles.

• It represents the probability of inheriting a specific genotype from two heterozygous parents.

• It shows the dominance hierarchy of alleles in a genetic cross.

• It signifies the presence of codominant alleles in the offspring.

Provide an example of incomplete dominance in plant species.

• Wavy hair in humans

• Tay-Sachs disease

• Human blood type

• Pink color in carnations