LECTURE 11 BILD1 S10

LECTURE 11 BILD1 S10 - Announcements Midterm#2 available...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Announcements Midterm #2 available after class if you signed for it Or pick-up exams in NSB 4119. Regrade requests due to Dr. Kiger NSB 6109 (leave in bin) by Mon., May 17th Review and learn from your Midterm Exams! Understanding meiosis will help understand next topic - genetics!! Problem Set #4 posted. Read the Chapters!! No time in class to cover in depth: - end of Chapter 14 (probability, complex genetics; p.269-281) - end of Chapter 15 (sex-linked, genetic disorders; p.297-302) Lecture 11 Mendelian Genetics & Chromosomal Inheritance Asexual vs. Sexual Reproduction Asexual reproduction One parent produces genetically identical offspring by mitosis Parent Bud 0.5 mm Sexual reproduction Two parents give rise to offspring with unique combinations of genes Figure 13.1 Offspring inherit a combination of parental traits Heredity transmission of traits from one generation to the next Variation offspring differ from parents and siblings Genetics scientific study of heredity and hereditary variation
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 What genetic principles account for the transmission of traits from parents to offspring? The “blending” hypothesis of inheritance - Genetic material from parents mix in each generation The “particulate” hypothesis of inheritance - Parents pass on discrete heritable units, genes X No Yes Gregor Mendel, the father of genetics Documented a “particulate” mechanism of inheritance -- parents pass on discrete heritable units, genes -- through his experiments with garden peas Figure 14.1 1857- Genetic Vocabulary Character a heritable feature, such as flower color Trait a variant of a character, such as purple or white flower colors Experimental discovery of inheritance mechanisms Mendel asked questions: What are the causes of variation in plants? Mendel devised carefully-planned experiments: Controlled breeding between varieties of garden peas and mathematical analysis of offspring Mendel interpreted his results: Discovered two Laws of inheritance !
Background image of page 2
3 Mendel’s Two Laws of Inheritance 1. Law of Segregation 2. Law of Independent Assortment Mendel’s Experimental, Quantitative Approach Mendel’s good decision to work with peas: “true-breeding” varieties control matings (parent crosses) track multiple generations “either-or” characters large sample size, for statistics Mendel’s breeding experiments: two-generational crosses Experimental Design: “P generation” ( first cross ) Hybridization of 2 true-breeding varieties “F1 generation” ( used for second cross ) The hybrid offspring of P generation “F2 generation” ( the results!) The offspring of self-pollinated F1 individuals Figure 14.3 Purple flowers White flowers × Al plants had purple flowers P F1 F2 The Experimental Basis for Mendel’s Law of Segregation Results: P purple x white F 1 All offspring were purple F 2 many purple (n=705), some white (n=224) Ratio was 3:1 of purple:white Figure 14.3 Purple flowers White flowers × Al plants had purple flowers P F1 F2
Background image of page 3

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

View Full DocumentRight Arrow Icon
4 The Experimental Basis for Mendel’s Law of Segregation Mendel Concluded: Dominant vs. Recessive Traits:
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 13

LECTURE 11 BILD1 S10 - Announcements Midterm#2 available...

This preview shows document pages 1 - 5. Sign up to view the full document.

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