This chapter distinguish between the following terms: somatic cell and gamete, autosome and sex chromosomes, haploid and diploid; describe the events that characterize each phase of meiosis; describe three events that occur during meiosis I but not mitosis; name and explain the three events that contribute to genetic variation in sexually reproducing organisms. | Lecture Biology (7th edition) - Chapter 13: Meiosis and sexual life cycles Chapter 13 Meiosis and Sexual Life Cycles PowerPoint Lectures for Biology, Seventh Edition Neil Campbell and Jane Reece Lectures by Chris Romero Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • Overview: Hereditary Similarity and Variation • Living organisms – Are distinguished by their ability to reproduce their own kind Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • Heredity – Is the transmission of traits from one generation to the next • Variation – Shows that offspring differ somewhat in appearance from parents and siblings Figure Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • Genetics – Is the scientific study of heredity and hereditary variation Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • Concept : Offspring acquire genes from parents by inheriting chromosomes Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Inheritance of Genes • Genes – Are the units of heredity – Are segments of DNA Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • Each gene in an organism’s DNA – Has a specific locus on a certain chromosome • We inherit – One set of chromosomes from our mother and one set from our father Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Comparison of Asexual and Sexual Reproduction • In asexual reproduction – One parent produces genetically identical offspring by mitosis Parent Bud Figure mm Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • In sexual reproduction – Two parents give rise to offspring that have unique combinations of genes inherited from the two .
