PPT-0 13 Meiosis and Sexual Life Cycles

Variations on a Theme Living organisms are distinguished by their ability to reproduce their own kind Heredity is the transmission of traits from one generation to the next Variation is demonstrated by the differences in appearance that offspring show from parents and siblings. Chromosomes in Reproductive Cells? Introduction Sexual reproduction is a process that creates a new organism by combining the genetic material of two organisms. There are two main steps in sexual rep ABBOTTS COLLEGE. ABBOTTS. 1. TOPICS. 2. DEFINITIONS. Alternation of generations. Haploid. diploid. LIFE CYCLES OF:. Moss. A flower. PAGE 2.3.4. Asexual and sexual reproduction. Asexual . Sexual. Produces genetically identical organisms. LECA=last eukaryotic common ancestor as distinct from LUCA (last universal com. . a. nc.). Probably had the ability to reproduce sexually…how do we know this??. Transition to a sexual LECA involved 4 and we will focus on 3 “transitions. Sexual Life Cycles. modes of reproduction. diploid/haploid and meiosis. meiosis I and meiosis II phases. key differences between mitosis and meiosis. variation in position of meiosis in life cycles. why sex?. 1. Introductory Vocabulary. 2. Heredity. .  . t. he . transmission of traits from one generation to the next . Variation. .  when o. ffspring . differ somewhat from their parents and . siblings. Review of Mitosis. Mitosis is a form of . asexual reproduction. This means that it . only requires 1 organism . (ex. Skin cells dividing). For growth and repair in . somatic. (body) cells!. Results in 2 cells identical to the original (parent) cell. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings. Cell Cycle. 3. A . life cycle. of an organism is the generation-to-generation sequence of stages in its reproductive history.. 10.2 – Meiosis Sexual Reproduction Function: creates gametes (sperm, egg, pollen) for sexual reproduction . Meiosis: Cell division for sexual reproduction. Males - testes Females - ovaries Sex Cells Samantha Bonilla. Vocabulary. •. Karyotype. . •. Somatic cell. •. . Life cycle. •. . Homologous chromosome. •. . S. ex chromosome. •. . Autosome. •. . Diploid cell. •. . Haploid cell. Cell division / Asexual reproduction. Mitosis. produce cells with same information. identical daughter cells. exact copies. clones. same amount of DNA . same number of chromosomes. same genetic information. 1. MEIOSIS AND SEXUAL LIFE . CYCLES. Heredity. = Continuity of biological traits from one generation to the . next. Variation. = Inherited differences among individuals of the same . species. Genetics. 1 identify the stages of meiosis. Only diploid cells caages of meiosis in a diploid cell where 2N = 6Meiosis involves 2 consecutive cell divisions. Since the DNA is duplicated result is 4 haploid cel Defined. : Gametes from two separate parents unite. Meiosis: Diploid (2n) to haploid (n) cells . Mechanism that allows for . genetic diversity. Many eukaryotes reproduce in this manner. Plants, animals and fungi. Lydia R. Leonardo, DrPH. Biology 133 Lecture. Second Half. Module 2:.  . Reproductive Organs and the Sexual Cycle.  . SEXUAL CYCLES and HORMONAL ACTIONS IN MAMMALS. Male cycle and its hormones. Module 3: Gametogenesis.