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Transcript
Tuesday, January 19, 2016 Day 1 Day 2 1. Please have these Items on your desk. Agenda Notebook Science Starters Sheet 2- Science Starter: What does heterozygous dominant mean? Give an example. If a trait is recessive, is it heterozygous or Homozygous? To do list. . . . . Update the goal sheet. Pick four assignments or notes and update the goal sheet. Finish notes on Punnett square. Practice making Punnett squares. Table of Contents Update Page 85 1/15 Genes, Heredity & DNA Baker 2003/2004 Whose got Genes? Part 2 Genes, Heredity, & DNA Baker 2003/2004 Who was Gregor Mendel? Austrian monk who studied mathematics and science As a boy he could predict the possible types of flowers and fruits that would result from crossbreeding two plants in his father’s garden Picture taken from biography.com Baker 2003/2004 Who was Gregor Mendel? Curiosity about the connection between the color of a pea flower and the type of seed that same plant produced inspired him to begin experimenting with garden peas in 1856. Made careful use of scientific methods, which resulted in the first recorded study of how traits pass from one generation to the next. Baker 2003/2004 Define HEREDITY The passing of traits from parent to offspring Baker 2003/2004 Define ALLELE The different forms of a trait that a gene may have One form of a gene Baker 2003/2004 What is HOMOZYGOUS? AA aa Both alleles [forms of the gene] are the same When offspring inherit two dominant genes, (one dominant gene from each parent) they are said to be homozygous dominant When offspring inherit two recessive genes, (one recessive gene from each parent) they are said to be homozygous recessive Baker 2003/2004 What is HETEROZYGOUS? Aa When alleles occur in different forms When offspring inherit one dominant gene and one recessive gene, they are said to be heterozygous Since the dominant gene will be expressed, they are said to be heterozygous dominant Baker 2003/2004 Generation 1 B B b b B Brown Eyes are Dominant to b Blue Eyes b b b Heterozygous Homozygous recessive Genotype b B b 2 Bb 2bb b b Phenotype 50% Brown 50% Blue Baker 2003/2004 Generation 2 B Brown Eyes are Dominant to b Blue Eyes B b B B b B b Homozygous Dominant Homozygous Recessive Genotype b B b B b 4 Bb Phenotype 100% Brown Eyes Baker 2003/2004 Generation 3 B Brown Eyes are Dominant to b Blue Eyes B B B B B B B Homozygous Dominant Heterozygous Genotype b B b B b 2 BB 2 Bb Phenotype Baker 2003/2004 100% Brown Eyes
