Genetics-Pedigree-Analysis-PowerPoint.pdf
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This document discusses pedigree analysis, which uses family trees to determine genetic traits. It provides examples of how to read a pedigree analysis by representing individuals as shapes corresponding to their sex and coloring to indicate if they are homozygous dominant, recessive, or carriers. Questions are presented about relationships between individuals and their traits based on three example pedigrees provided. Key points covered include how to identify males and females, generations, individual designations, and determining traits and relationships from the analyses.
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Assignment
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1.Each
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Assignment
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1.Each
student will make a drawing of a family pedigree. You need to trace the trait for 3 generation. This includes grandparents, their children (parents, aunts and uncles), and their children (daughters, sons, cousins). Label your diagram and identify the people affected by the trait. You do not need to look at your family. You can use somebody else’s family.
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carefully
. Guess the genotype for each of your members of a pedigree.
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How to construct a human pedigree:
Generations are numberered from the top of the pedigree in uppercase Roman numerals, I, II, III etc. Individuals in each generation are numbered from the left in arabic numerals as subscripts, III
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etc.T
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This document discusses several types of non-Mendelian inheritance patterns:
1. Incomplete dominance results in a third phenotype between the two parental traits. A red/white flower cross results in pink flowers.
2. Codominance occurs when both alleles are fully expressed in the phenotype, such as black and white fur in a spotted cow.
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This document discusses several types of non-Mendelian inheritance patterns:
1. Incomplete dominance results in a third phenotype between the two parental traits. A red/white flower cross yields pink flowers.
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- 2. Pedigree Analysis 1 Another way you can determine traits is by a Pedigree Analysis In a Pedigree Analysis instead of seeing just the parents alleles you can see the entire known family tree.
- 3. Pedigree Analysis 2 Males are represented as squares Females are represented as circles Homozygous Dominant are blank Homozygous Recessive are colored Heterozygous (carriers) are half blank
- 4. Pedigree Analysis 3 This line represents a mating This line shows the offspring from the mating Each generation is shown by a Roman Numeral Each individual within a generation is designated by a number
- 5. Pedigree Analysis: Example 1 Look at the following Pedigree Analysis for a recessive trait in the Shackleford Banks horses. How many males have the trait? Females? Are there any carriers?
- 6. Pedigree Analysis: Example 1 Answers Males- I1, II1, III1 Females- None are Homozygous for the trait Carriers- II2, II3, II4, III2
- 7. Pedigree Analysis: Example 2 Looking at the Pedigree Analysis, answer the following questions. What is the relation between II3 and II4? What is the relation between III3 and III5? What is the relation between III2 and III7? What is the relation between III2 and II5? How many cousins does III4 have? Upper Grades
- 8. Pedigree Analysis: Example 2 Answers What is the relation between II3 and II4? Married/Mated What is the relation between III3 and III5? Siblings What is the relation between III2 and III7? Cousins What is the relation between III2 and II5? Nephew/Aunt How many cousins does III4 have? 5 Upper Grades
- 9. Pedigree Analysis: Example 3 The following Pedigree Analysis is for the recessive trait blue eyes in horses. List all the male horses that will have blue eyes. List all the female horses that will be carriers for blue eyes. If you were to breed III1 with a male heterozygote what percent of the offspring will have blue eyes? What percent will be carriers? Upper Grades
- 10. Pedigree Analysis: Example 3 Answers Males with blue eyes- III3 Female carriers- I2, II4, II8, III5, III7 50% will have blue eyes, and 50% will be carriers Upper Grades