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 34a

20장, 문제 34a

Evaluate the following pedigree, and answer the questions below. Which individual(s) in this family is/are inbred?

검증된 단계별 안내

Step 1: Understand the concept of inbreeding. Inbreeding occurs when individuals who are closely related genetically (e.g., cousins, siblings) reproduce. This increases the likelihood of homozygosity for recessive alleles, which can lead to genetic disorders.

Step 2: Analyze the pedigree chart provided. Look for instances where individuals share common ancestors, indicating a potential inbreeding event. Specifically, trace the lineage of each individual to identify shared ancestry.

Step 3: Focus on the offspring of unions between individuals who are related. In the chart, identify any individuals whose parents are cousins or otherwise closely related.

Step 4: Highlight the individuals who are products of such unions. For example, if two cousins have children, those children are considered inbred because their parents share a common ancestor.

Step 5: Confirm the inbred individuals by verifying the shared ancestry of their parents. Use the pedigree chart to ensure that the parents are indeed related and that the offspring are direct descendants of this union.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

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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 transmission of genetic traits across generations. By analyzing the pedigree, one can identify carriers of specific traits, determine the mode of inheritance, and assess the likelihood of traits appearing in future generations.

Inbreeding

Inbreeding refers to the mating of individuals who are closely related genetically, which can increase the probability of offspring inheriting genetic disorders. In a pedigree, inbreeding is often indicated by a mating between individuals who share a common ancestor. This practice can lead to a higher incidence of homozygous recessive conditions due to the increased likelihood of both parents carrying the same recessive alleles.

Symbols in Pedigrees

In pedigree charts, specific symbols are used to represent individuals and their relationships. Males are typically represented by squares, while females are represented by circles. A filled symbol indicates an affected individual, while an empty symbol indicates an unaffected individual. Understanding these symbols is crucial for interpreting the pedigree and identifying patterns of inheritance, including potential inbreeding.