PPT-Meiosis

Chromosome number Phases of meiosis Meiosis and genetics Gamete formation Comparing mitosis and meiosis Chromosome number A cell in adult drosphilia fruit fly has 8 chromosomes 4 of which came from the flys male parent and 4 of which came from the flys female parent. Each organism must inherit a single copy of every gene from each of its “parents.”. Gametes. are formed by a process that separates the two sets of genes so that each gamete ends up with just one set.. http://www.youtube.com/watch?v=lJzZ7p-47P8&feature=related. . State that meiosis is a reduction division of a diploid nucleus to form a haploid . nulcei. .. Define homologous chromosomes. Outline the process of meiosis, including pairing of homologous chromosomes and crossing over, followed by two divisions, which . Reduction Division. Mike Clark, M.D.. Meiosis. Meiosis is nicknamed reduction division. It is a process where a cell divides (division) but reduces the genetic material to ½ (reduction) . This type of cell division occurs in the gametes (sex cells). Chapter 12. Outline. Introduction. Asexual. Sexual Reproduction. The Phases of Meiosis. Division I. Division II. Alternation . of Generations. Introduction. Asexual . Reproduction . - . p. roduction . 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. Gametes. ________ are sex cells. . Haploid. The daughter cells produced at the end of meiosis II are considered- diploid or haploid?. Genetically DIFFERENT!. What is the genetic relationship of daughter cells to each other in meiosis?. CfE Advanced Higher Biology. Unit 2: Organisms and Evolution. 2bii. – Meiosis forms variable gametes. Terminology (4). Sexual life cycle of animals (1). Meiosis – an overview (1). Meiosis I (4). Chapter 10. Overview of Meiosis. 10.1. Overview of Meiosis. Meiosis. - type of nuclear division that reduces the chromosome number from the diploid number to the haploid number.. Gametes. - reproductive cells. Alleles segregate during meiosis allowing new combinations to be formed by the fusion of gametes. . Understandings:. One diploid nucleus divides by meiosis to produce four haploid nuclei. . The halving of the chromosome number allows a sexual life cycle with fusion of gametes. . Chapter 8. Asexual vs. Sexual reproduction. Asexual reproduction – new organisms/cells are genetically identical to parent cells/organisms . Sexual reproduction – offspring have a combination of genes from both parents. . Mistakes in Meiosis. Many genetic disorders can be traced back to . errors in formation of the gametes . in meiosis. Could occur as the result of:. Mistakes in . separation of the chromosomes . during division. Image from about.com . meiosis_metaphase_1.jpg. . Mutations. (changes in an organism’s DNA) are the . original. . source of . all. genetic variation. Mutations create different versions of genes called . Mrs. Stewart. Biology I . Stewarts Creek High School. Objectives:. Differentiate between the process of mitosis and meiosis. Demonstrate the movement of chromosomes throughout meiosis. Analyze how meiosis leads to genetic variation. Suppose that the . anole lizard has . fifty-two. chromosomes in the nucleus of its body or somatic cells. How many chromosomes will be in the . unfertilized. . egg. of . an anole lizard. ?. 1. 13.