Why do the cardiac muscles cells demonstrate autorhythmicity?
1/17/2018 Intro to Genetics Gregor Mendel: Known for experimenting with pea plants, illustrated the important genetic principles of inheritance Garden pea, Pisum sativum: were “model organisms” because they were easy to reproduce being that they selffertilized. True breeding: exhibit the same trait Theodor Boveri: Discovered the existence of chromosomes and their unique genetic makeup Hereditary: gene passed from parent to offspring Connected chromosomes to Mendel’s’ principles of inheritance Frederick Griffith: Worked with two strains of Streptococcus pneumoniae (Strep throat) bacteria 1. Strains that secrete capsules appear smooth (type S) and are virulent or lethal in mice 2. Strains that don’t secrete capsules appear rough (type R) and are benign The capsules secreted create a protective coat around the bacteria making it harder for the mouse’s immune system to kill it ransformation Principle: Genetic material was transferred when Griffith injected living type R and heat killed type S bacteria into the mouse. Hershey & Chase: Studied bacteriophage that infects E. coli Phage coat is made of protein DNA is found inside capsid DNA DNA Protein Phage head (capsid)