Genetics Ch 2 8/26-8/28
Genetics Ch 2 8/26-8/28 BIOL 3721 - 01
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This 3 page Class Notes was uploaded by Cherith Notetaker on Saturday August 29, 2015. The Class Notes belongs to BIOL 3721 - 01 at Youngstown State University taught by David K Asch, Chester R Cooper & Heather Elizabeth Lorimer in Fall 2015. Since its upload, it has received 111 views. For similar materials see Genetics in Biology at Youngstown State University.
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Date Created: 08/29/15
Genetics Ch 2 826828 Slide 35 gt every gamete must have one allele from each gene 0 fatal if any are missing Slide 36 gt a branched diagram tracks the probability of potential outcomes 0 is equivalent to a Punnet square Two General Biological Principles 1 gene alleles segregate during eggpollen formation 2 different gene alleles assort independently Flaw of Mendelian Analysis gt though it can predict probabilities of large populations it cannot predict the outcome of an individual 0 eg can t predict phenotype of any one F2 individual Important Concepts gt genes are discrete units that control the appearance of inherited traits 0 alternative forms are alleles gt sexually reproducing organisms possess two alleles for every gene O may be homozygous or heterozygous gt genotype alleles phenotype physical traits gt dominant alleles exhibit phenotype of heterozygotic individuals recessive allele phenotype is not exhibited unless individual is homozygous O monohybrid heterozygous crosses produce offspring with dominant and recessive traits in 31 ratio gt segregation causes gametes to possess only one allele of each gene 0 gametes from each parent unite randomly during fertilization O Mendel s law of segregation gt alleles of different genes segregate independently of one another 0 Mendel s law of independent assortment O phenotype 9331 gt expression of dominant alleles is caused by presence of a functional protein 0 recessive allele lacks the protein or has a less functionalnonfunctional protein Slide 46 Key for simple Mendelian Recessive Inheritance gt two unaffected parents with recessive alleles can have a recessive affected child 0 phenotype is produced by parents without the visible trait 0 child will be recessive and exhibit the trait Vertical and Horizontal Patterns gt refers to visual pattern of a pedigree and if every affected person has an affected parent gt not the same as vertical inheritance O inheritance is naturally vertical 0 all inheritance is vertical Slide 48 affected a visible thing having physical trait infected foreign body enters your body and makes you sick vertical pattern 7 vertical inheritance fatal genetic disease is rarely dominant 0 individuals must be homozygous recessive to exhibit trait 0 if disease is lethal enough individual would die before VVVV passing on gene Slide 54 gt Consanguineous being blood relatives of a recent common ancestor O consanguineous mating 0 increases probability that kids of unaffected parents will be affected l affected parent may be fine children may not live long enough to pass on gene
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