PDF-n MEIOSIS FERTILIZATION Ovary Testis Diploid zygote 2n 46 Mitosi

Necessary only for sexual reproduction Sister separate Sister chromatids remain attached Pairs of homologous chromosomes split up Chromosomes duplicate Homologous chromosomes red and blue pair and. Organisms that reproduce sexually have specialized cells called gametes (sex cells). Gametes are the result of a type of cell division called meiosis. Diploid and haploid. Almost all human cells are . . Fertilization . – Union of 2 parent cells.. Sperm and egg cells called . gametes. .. Product of egg . +. sperm = fertilized egg = . zygote. .. . Embryo. = early stages of an organism’s development; from first cell division to end of 8. Obectives. Describe the result of meiotic division in terms of sexual reproduction. Discuss the structure of homologous chromosomes. Describe chromosomes in terms of ploidy. Distinguish between sexual and asexual reproduction. Take out a piece of paper and write for two minutes what makes you unique . . Human. Cat. Shrimp. Bean. Before Meiosis. Chromosome. number (haploid or diploid?. 46. ?. ?. ?. Number of pairs of homologous. 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?. (Begin on Page 463). Fertilization. In human mating, hundreds of . millions. of sperm are ejaculated into the . vagina. . The sperm then pass through the . cervix. , up through the . uterus. , and into the . Gamete vs. Zygote. What is a Gamete?. Egg & Sperm . What is a Zygote?. When two gametes come together (fertilization). Why your body can . not. use mitosis to make sperm or eggs?. A typical cell in your body has 46 chromosomes (23 pairs of homologous chromosomes). Suppose that human sperm and eggs were produced by mitosis. How many chromosomes would each sperm or egg have?. .. DNA . in cells is usually spread out so transcription can take place.. During . cell division, . chromosomes. form. .. Chromosomes are . DNA. and protein (. histones. ) coiled into a rod.. After DNA replicates, two . Samantha Bonilla. Vocabulary. •. Karyotype. . •. Somatic cell. •. . Life cycle. •. . Homologous chromosome. •. . S. ex chromosome. •. . Autosome. •. . Diploid cell. •. . Haploid cell. Organisms that reproduce sexually are generally diploid: each cell contains two sets of chromosomes—a maternal chromosome set and a paternal chromosome set—one inherited from each parent. . . Google Images. Haploid. Chromosome. Chromatid. Chromatin. Crossing Over. Tetrad. Gene –A segment of genetic information on a chromosome. Codes for a specific . characteristic. Allele – A specific form of a gene. Parthenogenesis . is a type of asexual reproduction in which a female gamete or egg cell develops into an individual without fertilization.. or. Parthenogenesi. s is defined as unfertilized ovum development without fertilization.. . Human. Cat. Shrimp. Bean. Before Meiosis. Chromosome. number (haploid or diploid?. 46. ?. ?. ?. Number of pairs of homologous. chromosomes. 23. ?. 127. ?. After Meiosis I. Chromosome number (haploid or diploid?). to . haploid. Making . Gametes. : Egg and Sperm. The cell cycle remains the same except…. . G1. S. G2. Division: . meiosis. . & cytokinesis. Meiosis Overview. Process of nuclear division that reduces the number of chromosomes in new cells to .