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Related Concept Videos

Epistasis01:39

Epistasis

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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Epistasis Analysis01:09

Epistasis Analysis

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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
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Hardy-Weinberg Principle01:49

Hardy-Weinberg Principle

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Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
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Incomplete Dominance01:43

Incomplete Dominance

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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Related Experiment Video

Updated: Mar 1, 2026

Quantifying Abdominal Pigmentation in Drosophila melanogaster
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Research note: Comparative estimation of genetic parameters for eggshell pigmentation traits.

Runzhe Wang1, Jiahui Lai1, Honglei Jin1

  • 1National Engineering Laboratory for Animal Breeding and MOA Key Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China.

Poultry Science
|February 27, 2026
PubMed
Summary
This summary is machine-generated.

Quantities of true protoporphyrin IX (Qp) and Shell Color Index (SCI) best evaluate eggshell color variation. These indices are recommended for breeding programs to improve egg color in laying hens.

Keywords:
C*Eggshell colorEstimation of genetic parametersL*a*b*Q(p)SCIh°

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Area of Science:

  • Animal Science
  • Poultry Genetics
  • Colorimetry

Background:

  • Eggshell color diversity is significant, especially in protoporphyrin-pigmented shells.
  • The CIE L*a*b* system measures color, but lightness (L*) is often prioritized over a* and b* values.
  • Comprehensive indices like Qp, SCI, C*, and h° exist, but their suitability for evaluating eggshell color is unclear.

Purpose of the Study:

  • To compare the effectiveness of comprehensive eggshell color indices (Qp, SCI, C*, h°) in reflecting color variation.
  • To estimate genetic parameters for these indices in Rhode Island Red and Dwarf chickens.
  • To determine the most suitable indices for breeding programs.

Main Methods:

  • Collected eggshell color data from 1,481 Rhode Island Red and 1,938 Dwarf chickens at different ages (43, 60, 80 weeks).
  • Calculated genetic parameters for Qp, SCI, C*, and h°.
  • Assessed phenotypic correlations between indices and lightness (L*).

Main Results:

  • Qp showed the highest phenotypic correlation with L*, followed by SCI, h°, and C*.
  • Qp decreased with age, aligning with lighter eggshells in older hens.
  • All indices exhibited moderate to high heritability, with h° being the highest, followed by SCI, Qp, and C*.

Conclusions:

  • Qp and SCI are recommended as phenotypic parameters for eggshell color in breeding programs.
  • Adopting Qp and SCI can accelerate genetic progress for brown- and pink-shelled laying hens.
  • Further research may explore the combined use of these indices for optimal selection.