Trivia Quiz On Codominance And Incomplete Dominance!

1. 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 know as erminette.

What is the genotype for a black chicken?

What is the genotype for white chickens?

What is the genotype for erminette chickens?

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2. Incomplete Dominance

Both alleles are expressed and the phenotype is a blend

Both alleles are expressed and the genotype is dominant

Neither allele is expressed

Alleles are dominant or recessive

This answer suggests that in incomplete dominance, both alleles are expressed and the phenotype is a blend. This means that neither allele is completely dominant over the other, resulting in a phenotype that is a combination or mixture of the traits associated with each allele.

Explanation

This answer suggests that in incomplete dominance, both alleles are expressed and the phenotype is a blend. This means that neither allele is completely dominant over the other, resulting in a phenotype that is a combination or mixture of the traits associated with each allele.

3. What distinguishes codominance from incomplete dominance in genetic inheritance?

In codominance, one allele completely masks the effect of another.

In incomplete dominance, the phenotype of heterozygotes is a mix or blend of both alleles.

In codominance, both alleles are expressed fully and separately in the phenotype.

Both B and C are correct.

In genetic inheritance, incomplete dominance occurs when the phenotype of the heterozygotes is intermediate between those of the homozygotes, effectively blending the contributions of two different alleles (e.g., red and white flowers producing pink flowers). Codominance, on the other hand, involves a scenario where both alleles in a heterozygote are fully expressed without blending, leading to a phenotype that clearly shows both alleles separately (e.g., a cow with both red and white patches where both color genes are expressed). Thus, options B and C correctly describe these patterns, making D the correct combined answer.

Explanation

In genetic inheritance, incomplete dominance occurs when the phenotype of the heterozygotes is intermediate between those of the homozygotes, effectively blending the contributions of two different alleles (e.g., red and white flowers producing pink flowers). Codominance, on the other hand, involves a scenario where both alleles in a heterozygote are fully expressed without blending, leading to a phenotype that clearly shows both alleles separately (e.g., a cow with both red and white patches where both color genes are expressed). Thus, options B and C correctly describe these patterns, making D the correct combined answer.

4. Click all the ones that show Codomanince.

A chicken with white feathers and a roster with black feathers makes a chicken with white and black feathers.

Parents with blood types of A and B, have a child with AB blood

A child with brown eyes has parents with brown and green eyes.

The given answer is correct because it includes all the examples that demonstrate codominance. In codominance, both alleles in a gene pair are expressed equally and simultaneously, resulting in a phenotype that shows a combination of both traits. In the examples provided, the chicken with white and black feathers, the parents with blood types A and B having a child with AB blood, and the flowers with red and white petals are all instances of codominance, where the traits from both parents are expressed in the offspring.

Explanation

The given answer is correct because it includes all the examples that demonstrate codominance. In codominance, both alleles in a gene pair are expressed equally and simultaneously, resulting in a phenotype that shows a combination of both traits. In the examples provided, the chicken with white and black feathers, the parents with blood types A and B having a child with AB blood, and the flowers with red and white petals are all instances of codominance, where the traits from both parents are expressed in the offspring.

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5. If you cross a red plant with a white plant and the offspring is pink, what is that called?

When a red plant is crossed with a white plant and the resulting offspring is pink, it indicates incomplete dominance. Incomplete dominance occurs when neither of the parental traits is completely dominant over the other, resulting in a blending or intermediate phenotype. In this case, the pink color is a combination of the red and white traits, rather than one trait being dominant over the other.

Explanation

When a red plant is crossed with a white plant and the resulting offspring is pink, it indicates incomplete dominance. Incomplete dominance occurs when neither of the parental traits is completely dominant over the other, resulting in a blending or intermediate phenotype. In this case, the pink color is a combination of the red and white traits, rather than one trait being dominant over the other.

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6. Click all of the examples that show INCOMPLETE DOMINANCE.

A blue flower and green flower cross and make a turquoise colored flower

One parent with straight hair and the other parent with curly hair have kids with wavy hair.

A brown cow and a black blue bull have a calf that is brown and black.

The examples that show incomplete dominance are: A blue flower and green flower cross and make a turquoise colored flower, A female dog with a short tail and a male dog with a long tail have puppies with a medium length tails, and One parent with straight hair and the other parent with curly hair have kids with wavy hair. In incomplete dominance, neither allele is completely dominant over the other, resulting in a blending or combination of traits in the offspring.

Explanation

The examples that show incomplete dominance are: A blue flower and green flower cross and make a turquoise colored flower, A female dog with a short tail and a male dog with a long tail have puppies with a medium length tails, and One parent with straight hair and the other parent with curly hair have kids with wavy hair. In incomplete dominance, neither allele is completely dominant over the other, resulting in a blending or combination of traits in the offspring.

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7. In codominance, both alleles are expressed _______ in the phenotype of the organism.

Codominance occurs when both alleles for a gene are fully expressed in the phenotype of an organism, without one being dominant over the other. This means both traits are visible simultaneously. A classic example is the AB blood type in humans, where both A and B alleles are expressed equally.

Explanation

Codominance occurs when both alleles for a gene are fully expressed in the phenotype of an organism, without one being dominant over the other. This means both traits are visible simultaneously. A classic example is the AB blood type in humans, where both A and B alleles are expressed equally.

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8. Which term describes a genetic scenario where both alleles in a heterozygote are fully expressed, leading to offspring with a phenotype that is neither dominant nor recessive, but a mix of both parental traits?

Codominance occurs when both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits without blending. An example is the AB blood type in humans, where both A and B alleles are expressed equally.

Explanation

Codominance occurs when both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits without blending. An example is the AB blood type in humans, where both A and B alleles are expressed equally.

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