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Lecture

Biol 121 225 Freeman 276-281, 286-289

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Department
Biology
Course
BIOL 121
Professor
All Professors
Semester
Fall

Description
Biol 121 225 Freeman 276-281, 286-289 Feb 8, 10 Ch. 13, Linkage Wild type -individuals with the most common phenotype Mutation/mutant -change in a gene (mutant = individuals with mutated traits) Reciprocal cross -set of matings where mother’s phenotype in first cross is father’s phenotype in second cross; and father’s phenotype in first cross is mother’s phenotype in second cross Sex chromosomes -sex chromosomes refer to the X and Y chromosomes in organisms -X and Y chromosomes are different in size and shape – the Y chromosome is smaller -they also contain different genes -however, they have regions that are similar enough to lead to proper pairing during prophase I of meiosis I -male: XY, female: XX X-linkage or X-linked inheritance -the gene for a trait is located on the X chromosome and the Y chromosome does not carry an allele for the gene -Y-linkage is the opposite -though X and Y chromosomes synapse during prophase I, they differ in size, shape and gene content Autosomal inheritance -genes on non-sex chromosomes show autosomal inheritance Linkage -the physical association of genes that are found on the same chromosome -if two or more genes are linked, it means they are located on the same chromosome -linked genes violate the principle of independent assortment -two alleles for two different genes located on one chromosome will be inherited together -an exception to this is due to recombination because of crossing over in prophase I of meiosis Physical distance between genes (b/t -greater physical distance between genes increases the chance that crossing loci) over will take place between them -then, it is possible to figure out where genes are in relation to each other based on the frequency of recombinants between various pairs Genetic map -a diagram that shows the relative positions of
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