LS2 midterm 2 notes

LS2 midterm 2 notes - Mendelian Genetics Probability 0event...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Mendelian Genetics •Probability   -0-event will not happen   -1-event must happen •The sum of all probabilities of all possibilities must equal 1  - “and” –multiply - “or” –add •Inheritance or heredity  -Transmission of Traits from one generation to the next •Variation -offspring differ •Genetics -study of heredity •Locus -Location of gene on chromosome •Alleles -different versions of genes -Dominant Allele in Uppercase -Recessive Allele in Lowercase •Homozygous dominant -Same allele at a particular locus are both dominant •homozygous recessive -same allele at a particular locus are both recessive •Heterozygous •Phenotype -Physical Appearance -ex: Blood type, Behavior, Metabolic processes •Genotype -Genetic Makeup •Source of Variation -Independent Assortment   •50/50 chance sister chromatids will end up on one side or another -Crossing over    •Homologous Chromosomes exchange parts •inheritance is particulate -Parent s pass on discrete units (Genes) to children -Genes are more like deck of cards than bucket of paint  •Gregor Johann Mendel -Law of Segregation
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
  1.)Alternate versions (alleles) of genes account for variations   2.) Organism inherits 2 alleles for each trait   3.) Dominant allele will be expressed   4.) 2 alleles for each trait segregate during gamete formation •Punnet Square -Mendel’s Law of Segregation was derived from breeding -Law of Independent Assortment Example: Y= yellow         y= green           R=Round              r= Wrinkled When crossing two heterozygous yellow, round peas (YyRr): YR Yr yR yr Y R YYR R YY Rr YyR R YyRr Yr YYR r YYr r YyR r Yyrr y R YyR R Yy Rr yyR R yyRr yr YyR r Yyrr yyR r yyrr •Independent Assortment -Pairs of Alleles sort out independently of other pairs     •Genes are on Different Chromosomes         -Can also be on same chromosomes     •sort independently due to crossing over     •Genes Close to  each other are likely to sort dependently     •Genes far from each other are likely to sort independently •Applied Mendelian Genetics -A,B,O Blood Group: Codominance     •Two alleles both affect phenotype in separate, distinguishable ways -Incomplete Dominance     •Most often found in plance     •Neither color completely dominates the other     •Genes Remain distinct units     •Result is a mixture
Background image of page 2
   •Do not get ever-finer varieties of pink •What about characteristics that look continuous (Such as height)? -Controlled by many genes
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 14

LS2 midterm 2 notes - Mendelian Genetics Probability 0event...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online