Genetics Practice Problem: Incomplete Dominance
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Questions and Answers

What is the result of crossing a homozygous red flower with a homozygous white flower in snapdragons and four o'clocks?

  • A homozygous red flower
  • A heterozygous pink flower (correct)
  • A homozygous white flower
  • A heterozygous red flower

What is the term used to describe the phenomenon where the alleles blend together to produce a phenotype that is in between the phenotypes of the parents?

  • Recessive
  • Dominance
  • Incomplete Dominance (correct)
  • Codominance

What is the genotype of a heterozygous pink flower in snapdragons and four o'clocks?

  • WW
  • WR
  • RW (correct)
  • RR

What is the expected outcome of crossing two pink flowering plants?

<p>A mixture of red, white, and pink flowers (B)</p> Signup and view all the answers

What is the genotype of the parents in the cross between a pure-breeding white radish plant and a purebreeding red radish plant?

<p>WW and RR (C)</p> Signup and view all the answers

What is the term used to describe a gene that has three or more alleles in a population?

<p>Multiple alleles (B)</p> Signup and view all the answers

What is the order of dominance for the coat color alleles in rabbits?

<p>C &gt; ch &gt; cch &gt; c (C)</p> Signup and view all the answers

What is the phenotype of a rabbit with the genotype 'CC'?

<p>Full color (wild type or agouti) (D)</p> Signup and view all the answers

What type of inheritance is demonstrated by the coat color alleles in rabbits?

<p>Dominance hierarchy (D)</p> Signup and view all the answers

What is the term used to describe the interaction between two alleles where neither is dominant?

<p>Incomplete dominance (A)</p> Signup and view all the answers

What type of dominance is exhibited in the flower color of the plant?

<p>Incomplete Dominance (C)</p> Signup and view all the answers

What is the genotype of the first parent in the cross?

<p>LlRR (D)</p> Signup and view all the answers

What is the probability of a long, red offspring resulting from the cross?

<p>4/16 (B)</p> Signup and view all the answers

How do the IA and IB alleles interact in determining blood type?

<p>IA and IB are codominant (B)</p> Signup and view all the answers

What is the genotype of an individual with type O blood?

<p>ii (C)</p> Signup and view all the answers

What is the term for the interaction of many genes that determines a given characteristic?

<p>Polygenic inheritance (A)</p> Signup and view all the answers

What is the result of breeding a full-color rabbit with a genotype of Ccch and a Himalayan rabbit with a genotype of chc?

<p>A mix of full-color and Himalayan offspring (A)</p> Signup and view all the answers

What type of inheritance pattern shows a gradual range of characteristics, rather than distinct groups?

<p>Polygenic inheritance (A)</p> Signup and view all the answers

What is the principle that states that alleles of a gene for one trait segregate independently of the alleles of a gene for another trait?

<p>Independent assortment (C)</p> Signup and view all the answers

What is the term for the situation where both alleles of a gene are expressed equally in the phenotype?

<p>Codominance (D)</p> Signup and view all the answers

Flashcards

Snapdragon/Four O'Clock Cross

A heterozygous pink flower results from crossing a homozygous red flower with a homozygous white flower in snapdragons and four o'clocks due to the blending of alleles.

Incomplete Dominance

Incomplete dominance is a pattern of inheritance where the heterozygous phenotype is intermediate between the two homozygous phenotypes.

Heterozygous Pink Flower

The genotype RW represents a heterozygous pink flower in snapdragons and four o'clocks, where R represents the red allele and W represents the white allele.

Crossing Pink Flowers

Crossing two pink flowering plants (RW) will result in a 1:2:1 ratio of red, pink, and white flowers, respectively, due to the segregation of alleles.

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Parent Genotypes

The parents in the cross between a pure-breeding white radish plant and a pure-breeding red radish plant have the genotypes WW (white) and RR (red), respectively.

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Multiple Alleles

A gene with three or more alleles in a population is referred to as having multiple alleles.

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Rabbit Coat Color Dominance

The order of dominance for rabbit coat color alleles is C (full color) > ch (chinchilla) > cch (Himalayan) > c (albino), meaning C is most dominant and c is least.

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Full Color Rabbit

A rabbit with the genotype CC exhibits full color (also known as wild type or agouti).

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Dominance Hierarchy

The inheritance pattern demonstrated by the coat color alleles in rabbits is a dominance hierarchy, where alleles have a clear order of dominance.

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Incomplete Dominance (Again)

Incomplete dominance occurs when two alleles interact but neither is dominant, leading to a blended phenotype.

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Flower Color Dominance

The flower color in the described example exhibits incomplete dominance, where the heterozygote has an intermediate phenotype.

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Parent 1 Genotype

The first parent in the cross has the genotype LlRR, where L represents the long allele (dominant) and l represents the short allele (recessive).

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Long Red Offspring Probability

The probability of a long, red offspring resulting from the cross is 4/16, or 1/4, because the cross produces 16 possible offspring combinations and 4 of those are long and red.

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IA and IB Codominance

IA and IB alleles are codominant in determining blood type, meaning both alleles are expressed equally, resulting in a mixture of antigens in the blood.

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Type O Genotype

An individual with type O blood has the genotype ii. This means they have two recessive i alleles.

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Polygenic Inheritance

Polygenic inheritance is the interaction of multiple genes to determine a single characteristic, often resulting in a continuous range of phenotypes.

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Full & Himalayan Rabbit Cross

Breeding a full-color rabbit with the genotype Ccch and a Himalayan rabbit with the genotype chc will result in a mix of full-color and Himalayan offspring.

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Continuous Range of Traits

Polygenic inheritance is a pattern of inheritance that shows a smooth range of characteristics, rather than distinct, separate categories.

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Independent Assortment

The principle of independent assortment states that alleles of a gene for one trait segregate independently of the alleles of a gene for another trait.

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Codominance

Codominance occurs when both alleles of a gene are expressed equally in the phenotype, resulting in a combination of both traits.

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