Non-Mendelian Genetics. Chapter Five
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1 Non-Mendelian Genetics Chapter Five
2 Altering Mendel s Ratios Two different types of complications: 1. Genotypic ratios follow Mendel s laws, but phenotypes do not Somehow the underlying genotypic ratios are hidden 2. Mendel s laws do not apply Both genotypes and phenotypes are not following Mendel s laws
3 Type 1 Laws in effect: Insert figure 5.2
4 Type 2 Mendel s Laws No Longer Apply 1. Mitochondrial Inheritance Mitochondria have their own DNA, which is solely maternally inherited 2. Linkage Two genes that are close together physically 3. Linkage Disequilibrium Two alleles that are not inherited separately
5 1. Mitochondrial Genes Mitochondria contains it s own DNA 37 genes Offspring s mitochondria come only from the oocyte, not from the sperm Therefore, mitochondrial genes are only inherited from the mother Maternal Transmission
6 1. Mitochondrial Genes Maternal Transmission: Insert figure 5.6 Genes don t follow Mendel s 1 st law: Two alleles segregate randomly during formation of gametes
7 2. Linkage Genes are located so close together on same chromosome that they don t separate during meiosis (or less often) These two genes don t follow Mendel s 2 nd law: Two genes will assort independently and randomly from each other
8 Linkage Two genes that are too close together physically to follow Mendel s law of independent assortment. Gene A Gene B They will always go into the same gamete together during meiosis
9 Mendel s Dihybrid cross: 4 different possible gametes YyRr YR Yr yr yr (¼) + (¼) + (¼) + (¼) = 1
10 Mendel s Dihybrid cross: With two independent genes F 2 looked like: Four Phenotypes: : 3 : 3 : 1
11 Mendel s Dihybrid cross: F 2 offspring of Dihybrid cross Four Phenotypes: new phenotypes recombinants original phenotypes parental or non-recombinant
12 Two Linked Genes: Only produce 2 gametes YR (½) YyRr yr (½) YyRr YR (½) yr (½) YYRR YyRr ¼ ¼ YyRr ¼ yyrr ¼ Two Phenotypes 3 : 1 yellow round green wrinkled Traits transmitted together
13 Dihybrid with Linked Genes F 2 offspring with two linked genes: Two Phenotypes: original phenotypes parental or non-recombinant new phenotypes recombinants Recombinants are not present, or they are reduced.
14 Summary of Linkage Two genes are so close together physically that they are inherited together This will lead to breaking Mendel s 2 nd Law Causes a huge increase in the amount of parental offspring Or a huge decrease in the amount of recombinant offspring Offspring that do not look like parents
15 Recombination Mapping Number of recombinations will tell you how close two genes are genetically to each other 1. Examine offspring and count number of recombinant individuals 2. Divide by total number of offspring to calculate recombination frequency 3. 1 % RF = 1 centimorgan (cm)
16 Example Calculate RF In 100 offspring: 96 have parental genotypes 4 have recombinant genotypes 4/100 = 4% Recombination Frequency = 4% Genetic distance = 4 cm Two genes are linked because genetic distance is less than 50% or 50 cm
17 Genetic vs. Physical Distance Genetic Distance = how often two genes will be inherited together (cm) Close together, inherited often/always Physical Distance = how many base pairs are actually physically separating two genes (Mb) Larger physical distance, larger genetic distance However, correlation is not perfect [ hot spots ]
18 Linkage Mapping Two genes that are too close together physically to follow Mendel s law of independent assortment. Disease Marker Use this concept to help identify disease causative genes.
19 Linkage Mapping Start with a trait of interest Phenotype a large group of individuals (or families) for trait Genotype everyone for markers across entire genome Is there any correlation between any of the markers and the trait?
20 How To Calculate Linkage? Determine whether two loci segregate independently in meiosis. If two loci are linked the number of nonrecombinant meioses (parental) would be larger than recombinant meioses. In Model Organisms, just count traits in offspring, calculate Recombination Frequency (RF or cm) directly.
21 Humans: Good for changing light-bulbs, bad for genetics Can t set up crosses Few offspring Few simple traits to follow Find and use pedigrees Well-documented As large as possible
22 Pedigree for Huntington s Disease
23 Polymorphisms: Regions of genome that have two or more alleles, all of which are neither harmful or helpful ( anonymous ) Marker - Used to locate a point on the genome (Like a sign on the side of the freeway 300 Miles to LA vs. 30 cm to HLA gene) Genotype everyone in the pedigrees for all polymorphisms
24 Genotyping Type with 300 markers to cover entire genome every 10 cm Using molecular biology determine every individual s genotype for every marker Match up each individual s genotypes to their phenotypes for trait of interest
25 Linkage Analysis Determine whether two loci segregate independently in meiosis Disease locus and marker locus If two loci are linked the number of parental meiosis would be larger than recombinant meiosis Test: whether marker-locus genotype is independent of disease phenotype Is disease phenotype carried together with marker locus genotype?
26 Genotype of Markers to Identifying Disease Loci? 300 tests of linkage - between known marker loci and unknown disease loci Disease locus must sit somewhere in genome right? Therefore will find linkage between one of these markers and disease loci Possible problems?
27 LOD Score LOD = Logarithm of ODds Ratio LOD = log 10 (likelihood of genotype/phenotype data assuming linkage) (likelihood of genotype/phenotype data assuming no linkage) Calculate a LOD score for every single marker tested and add up the LOD scores of each separate pedigree in one study
28 Significant LOD Score General: LOD 3.0 is considered significant LOD 3.0 means observed data is 1000 fold more likely to be linked than unlinked Lander: LOD 3.6 actually gives 5% chance of false positive in whole genome scan
29 Questions? What are two types of complications that form non- Mendelian phenotype ratios? Which are breaking Mendel s Laws? Which are actually still following Mendel s laws? How does each of them still follow Mendel s Laws if they are producing non-mendelian ratios? What is Linkage? How is genetic distance different than physical distance? How is Linkage Analysis/Mapping done?
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