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. 8.3. Starter. How many chromosome pairs do humans have?. 23 pairs. What are the sex chromosomes and how is it determined if a person is male or female?. X and Y. Male = XY, Female = XX. Do you know any conditions that are sex linked?. a/a – a is the allele and / represents the two chromatids – there are two alleles for a diploid organism. a b/a b – two different genes on the same chromosome. a/a ; b/b – two different genes on different chromosomes ; designated separate chromosomes. 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. Chapter 13. Alleles and Traits. Blending . inheritance. Example: Black and white horse will produce . _________offspring. Failed to explain how traits disappear over several generations and then . _________________unaltered . 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). L. . Cistue. , A. Cuesta-Marcos, S. Chao, B. . Echavarri. , Y. . Chutimanitsakun. , A. Corey, . T. . Filichkina. , N. . Garchia. -Marino, I. . Romagosa. , P. M. Hayes. Rationale/Goals. Aimed to increase the Oregon Wolfe Barley population size to create a more useful linkage map. 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. . 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.. Development of gonads. David Dora. . Semmelweis University, . Department of Anatomy. 2017. Developmental biology I.. Determination of sex. Formation and migration of PGCs . Formation of gonad primordia, colonisation by PGCs. The term . sex . refers to sexual phenotype.. . Most organisms . have only two sexual phenotypes: . male and female. . The fundamental difference between males and females is gamete size: . males produce small gametes. . 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. 1. 2. Sexual Reproduction. . Involves the production of sex cells (gametes) and the fusion of their nuclei (fertilization), producing a fertilized egg cell (zygote). Gametes. Fertilization. 3.