PPT-Gametes (Sex Cells)

Not all cells in the organism reproduce through mitosis If the organism reproduces sexually then it needs special cells Gametes egg or sperm cells Meiosis Meiosis Type of cell division by which gametes eggs and sperm are produced. (Body Cells). (Sex Cells). Examples of . somatic (body) cells:. spleen, kidney, eyeball. . The DNA in these cells are NOT passed on to your offspring!. Examples of . gametes (sex cells): . ova/egg and sperm. Meiosis. Meiosis is the cell division which produces the . sex cells . or . gametes. .. Meiosis occurs in the cells of the . reproductive organs. :. Sperm cells – testes. Ova (eggs) – ovaries. Pollen - anthers. 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. Meiosis produces gametes. . Meiosis was first observed by the Belgian cytologist Pierre-Joseph van Beneden in 1887. 60 years before we knew that DNA contained the genetic material. Gametes. 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). 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. . How do species become varied?. Do animals and plants reproduce the same ways?. Are there other ways that a species can be varied?. Asexual and Sexual Reproduction. Reproduction produces new individual species. The way a species reproduces determines how much variation the new individual will have. . Before we start genetics, let's review the process of what makes us all look different compared to our siblings, family, and classmates!. Sexual Reproduction. Sexual reproduction creates genetic variability. That is why we all look different and you look different from your siblings! . Meiosis The formation of gametes (sex cells) Some Vocab Haploid ( n ): one set of chromosomes Reproductive cells are haploid (23 Chromosomes in humans) Eggs Sperm Diploid ( 2n ): Quiz Bio161 Q1. The theory that holds that information from the soma is collected in the germ cells or gametes is called Pre- formationism . Blending theory. Spermism . Ovism . Pangenesis. Q2. What does the first law of Mendel predict about the gametes of an individual with genotype Aa? 2/24/16. Update Your Table of Contents!. Page 16 – Intro. To Genetics Guided Reading. Page 17 – Mendel, Somatic Cells, and Gametes. Organisms that reproduce . sexually . are made up of two different types of cells.. , depending . on the algal group. The main difference is obviously the DNA content that is . haploid instead . of diploid.. Different combinations of gamete types are . possible, . In the case of . isogamy. . 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?). “body cells”. DNA in body cells is not passed to offspring. Body cells contain pairs of chromosomes. Human body cells have 23 pairs, or 46 individual chromosomes. The Cell Cycle from Chapter 5 applies to Body Cells.