Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels

Sanders - Genetic Analysis: An Integrated Approach 3rd Edition

Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172당신이 사용하는 게 아니라요?교과서 변경

Sanders 3rd Edition

Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels

문제 33b

20장, 문제 33b

Evaluate the following pedigree, and answer the questions below for individual IV-1. What is F for this individual?

검증된 단계별 안내

Step 1: Understand the concept of 'F', which represents the inbreeding coefficient. It measures the probability that an individual has two alleles at a locus that are identical by descent due to shared ancestry.

Step 2: Analyze the pedigree provided. Identify all ancestors of individual IV-1 and determine if there are any loops in the pedigree (i.e., instances where the same ancestor appears more than once due to consanguineous mating).

Step 3: For each loop in the pedigree, calculate the contribution to the inbreeding coefficient using the formula:

F = Σ^{n} (1^{/ 2}) n^{+ 1}

, where n is the number of individuals in the loop excluding the individual being evaluated.

Step 4: Sum the contributions from all loops to determine the total inbreeding coefficient for individual IV-1. Ensure that you account for all possible paths of shared ancestry.

Step 5: Verify your calculations by cross-checking the pedigree and ensuring that all loops and shared ancestors have been accounted for correctly.

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주요 개념

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Pedigree Analysis

Pedigree analysis is a method used to study the inheritance patterns of traits in families. It involves creating a diagram that represents family relationships and the presence or absence of specific traits across generations. This visual representation helps in understanding how traits are passed down and can indicate whether a trait is dominant, recessive, or linked to sex chromosomes.

Coefficient of Inbreeding (F)

The coefficient of inbreeding (F) quantifies the probability that an individual has inherited identical alleles from both parents due to a common ancestor. It ranges from 0 (no inbreeding) to 1 (complete inbreeding). In pedigree analysis, calculating F helps assess the genetic diversity of a population and the potential for genetic disorders resulting from inbreeding.

Generational Relationships

Generational relationships in a pedigree chart indicate the lineage and connections between individuals. Each generation is typically represented by a horizontal row, with parents above their offspring. Understanding these relationships is crucial for determining the inheritance patterns of traits and calculating coefficients like F, as it allows for the identification of common ancestors and the degree of relatedness between individuals.