Codominance and Incomplete Dominance: Inheritance Patterns Quiz and Flashcards

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Questions and Answers

Which statement accurately describes the inheritance pattern of sickle-cell anemia?

Sickle-cell anemia is caused by a homozygous recessive allele (SS), while carriers are heterozygous (RS). (correct)

Sickle-cell anemia is caused by a homozygous dominant allele (SS), while carriers are heterozygous (RS).

Sickle-cell anemia is caused by a heterozygous allele (RS), while carriers are homozygous dominant (RR).

Sickle-cell anemia is caused by a heterozygous allele (RS), while carriers are homozygous recessive (SS).

In the context of multiple alleles, what is true about the inheritance of rabbit coat color?

There are exactly 2 alleles that determine rabbit coat color.

Rabbit coat color is determined by a single gene with multiple alleles.

Rabbit coat color is determined by a single allele with multiple phenotypes.

There are more than 144 alleles that contribute to rabbit coat color. (correct)

What is the correct genotype for a person with type AB blood?

AA BB

IA IB (correct)

IA IB i

Which of the following statements about polygenic traits is correct?

Polygenic traits require the interpretation of multiple genes. Signup and view all the answers

What is true about sex-linked traits?

Most sex-linked traits are recessive. Signup and view all the answers

According to the information provided, what is true about the inheritance of eye color?

Eye color is a polygenic trait influenced by multiple genes. Signup and view all the answers

In a cross between a red flower and a white flower exhibiting incomplete dominance, what would be the phenotype of the F1 offspring?

Pink flowers Signup and view all the answers

What is the key difference between incomplete dominance and codominance?

In incomplete dominance, the heterozygous phenotype is a blend of the two traits, while in codominance, both traits are expressed simultaneously. Signup and view all the answers

In a cross between a homozygous red flower (RR) and a homozygous white flower (rr) exhibiting incomplete dominance, what would be the genotypic ratio of the F2 generation?

1:2:1 (Red:Pink:White) Signup and view all the answers

Which statement best describes the relationship between the genotype and phenotype in cases of incomplete dominance?

The heterozygous genotype produces a phenotype that is a blend of the two homozygous phenotypes. Signup and view all the answers

Which of the following examples best illustrates the concept of codominance?

A cross between a roan cow (white hair intermingled with red hair) and a red cow producing offspring with roan coloration. Signup and view all the answers

In a cross between a homozygous black chicken (BB) and a homozygous white chicken (WW) exhibiting codominance, what would be the phenotype of the F1 offspring?

Chickens with black and white feathers intermingled Signup and view all the answers

Study Notes

Shorthorn Cattle and Sickle-Cell Anemia

Shorthorn cattle can be homozygous red (RR), homozygous white (WW), or heterozygous (RW) with both red and white hairs, known as "ROAN".
Sickle-Cell Anemia is caused by an abnormal hemoglobin, with normal hemoglobin being (RR) and sickle cell shaped blood cells being (SS).
People who are carriers (heterozygous) for the disease have a mixture of both normal and sickle cell (RS).

Multiple Alleles

Multiple alleles exist for a trait when there are more than 2 types of alleles.
Rabbits have over 144 alleles for coat color, and the same allele can be dominant or recessive depending on the context.
Multiple alleles allow for a larger number of genetic and phenotypic possibilities.
Examples of multiple allele inheritance include human blood type, fur color in animals, and hair and eye color in humans.

Human Blood Type

Blood type is determined by multiple alleles and co-dominance.
The gene for type A and the gene for type B are co-dominant, with IA and IB alleles producing A and B carbohydrates, respectively.
A person with both IA and IB alleles will have both A and B carbohydrates on their cells.
The gene for type O is recessive.

Polygenic Traits

Polygenic traits require the interpretation of many genes.
Polygenic inheritance is a complex inheritance pattern, resulting in continuous variation.
Examples of polygenic traits include height and other similar features.

Sex-Linked Traits

Sex-linked genes are found on the sex chromosomes (X or Y) and are often recessive.
Examples of sex-linked traits include adrenoleukodystrophy (ALD) and hemophilia, which are found mostly in boys.

Mendel's Classic Ratio

Mendel's classic ratio is a common outcome from certain crosses, with a 1:2:1 genotypic ratio and a 3:1 phenotypic ratio.
Not all inheritance is based on the rules of complete dominance.

Other Inheritance Patterns

Incomplete inheritance, also known as incomplete dominance, results in blending traits, where neither trait is dominant.
Co-dominance is a condition in which both alleles of a gene are expressed in heterozygous offspring, resulting in traits that show up together as spots or stripes.
Polygenic traits require the interpretation of many genes, resulting in continuous variation.
Sex-linked traits are found on the sex chromosomes (X or Y) and are often recessive.

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Description

Explore Mendel's classic genotypic and phenotypic ratios, including complete dominance. Learn about other inheritance patterns such as incomplete dominance, codominance, multiple alleles, polygenic traits, and sex-linked traits.

Mendel's Classic Ratio and Other Inheritance Patterns

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