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Wrights Approach in Contrast to Malecots Estimation Parameters and Measurements | Animal Husbandry & Veterinary Science Optional for UPSC PDF Download

Wright's Approach vs. Malecot's Estimation

  • Wright and Malecot provided differing perspectives on inbreeding effects.
  • Wright emphasized increasing homozygosity due to inbreeding, highlighting genetic consequences.
  • Malecot defined inbreeding as the probability of alleles at a locus being identical by descent.

Parameters and Measurements

Coefficient of Inbreeding:

  • The coefficient indicates increased homozygosity from mating closely related individuals.
  • It ranges from 0 to 1 or as a percentage (0.1% to 100%).

Calculation of Inbreeding Coefficient:

  • Wright introduced the concept in 1921 to quantify the level of inbreeding in populations.
  • It reflects the probable increase in homozygosity due to related individuals mating.

Genetic Impact of Inbreeding:

  • Inbreeding leads to more homozygosity, affecting the proportion of heterozygotes in the population.
  • Malecot's definition focuses on the probability of two alleles at a locus being identical by descent.

Interpretation and Examples

Inbreeding Coefficient Determination:

  • Calculating the probability that an individual received identical genes from a common ancestor.
  • Probability of homozygosity increases with inbreeding, impacting genetic diversity.

Pathways and Probability:

  • Examining gene transmission probabilities in inbred populations.
  • Probability calculations based on the relatedness of individuals and common ancestry.

Question for Wrights Approach in Contrast to Malecots Estimation Parameters and Measurements
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How does Wright's approach differ from Malecot's estimation in understanding the genetic consequences of inbreeding?
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Inbreeding Coefficient Calculation

Definition of IAS:

  • IAS (Inbreeding Coefficient of Individual X): It is calculated as the sum of all the paths of inheritance connecting the sire and dam of individual X.

Components of IAS:

  • Fx (Inbreeding Coefficient of Individual X): This represents the inbreeding coefficient of individual X.
  • Σ (Summation of All Paths): It signifies the sum of all paths of inheritance that connect the sire and dam of X.
  • n (Number of Segregations): Represents the number of segregations in a specific path between the sire and dam of X.
  • Finbreeding Coefficient of Common Ancestor: This is the inbreeding coefficient of the common ancestor for each path.

Explanation with Example:

  • Example: 
    Consider a scenario where individual X has a sire and dam with multiple paths of inheritance. The inbreeding coefficient is calculated by considering all these paths and the number of segregations in each path, along with the inbreeding coefficient of the common ancestor for each path. 

Question for Wrights Approach in Contrast to Malecots Estimation Parameters and Measurements
Try yourself:
What is the Inbreeding Coefficient of Individual X (IAS) calculated as?
View Solution

The document Wrights Approach in Contrast to Malecots Estimation Parameters and Measurements | Animal Husbandry & Veterinary Science Optional for UPSC is a part of the UPSC Course Animal Husbandry & Veterinary Science Optional for UPSC.
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FAQs on Wrights Approach in Contrast to Malecots Estimation Parameters and Measurements - Animal Husbandry & Veterinary Science Optional for UPSC

1. What are the key differences between Wright's approach and Malecot's estimation in calculating inbreeding coefficients?
Ans. Wright's approach focuses on measuring the probability that two alleles at a particular locus in an individual are identical by descent, while Malecot's estimation considers the probability that two individuals share a common ancestor at a certain distance back in their genealogy.
2. How do Wright's approach and Malecot's estimation differ in interpreting and applying inbreeding coefficients?
Ans. Wright's approach interprets inbreeding coefficients as the probability that two alleles are identical by descent, affecting the genetic diversity within a population. On the other hand, Malecot's estimation uses inbreeding coefficients to estimate the relatedness between individuals and the likelihood of shared ancestry.
3. Can you provide an example of how Wright's approach and Malecot's estimation are used in calculating inbreeding coefficients in a population?
Ans. In a population of fruit flies, Wright's approach may calculate the inbreeding coefficient based on the probability of two alleles being identical by descent at a certain locus. In contrast, Malecot's estimation may estimate the inbreeding coefficient by considering the probability of shared ancestry between individuals based on their genealogy.
4. How do researchers typically calculate inbreeding coefficients using Wright's approach and Malecot's estimation in genetic studies?
Ans. Researchers often use mathematical models and genetic data to calculate inbreeding coefficients based on Wright's approach, which involves analyzing allele frequencies and genetic relatedness. Malecot's estimation, on the other hand, requires analyzing genealogical information and the probability of shared ancestry between individuals.
5. What are the implications of using Wright's approach versus Malecot's estimation in understanding the genetic structure and relatedness within a population?
Ans. Wright's approach helps researchers assess the level of inbreeding and genetic diversity within a population, while Malecot's estimation provides insights into the relatedness between individuals and the likelihood of shared ancestry. Both approaches offer valuable information for understanding the genetic structure and dynamics of populations in genetic studies.
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