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Slides cover Meiosis and Mendelian/ Nonmendelian outlines

Slides cover Meiosis and Mendelian/ Nonmendelian outlines . Interphase. MITOSIS. MEIOSIS. Chiasma (site of crossing over). Parent cell (before chromosome replication). MEIOSIS I. Propase. Prophase I. Chromosome replication. Chromosome replication. Tetrad formed by

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Slides cover Meiosis and Mendelian/ Nonmendelian outlines

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  1. Slides cover Meiosis and Mendelian/ Nonmendelian outlines

  2. Interphase

  3. MITOSIS MEIOSIS Chiasma (site of crossing over) Parent cell (before chromosome replication) MEIOSIS I Propase Prophase I Chromosome replication Chromosome replication Tetrad formed by synapsis of homologous chromosomes Duplicated chromosome (two sister chromatids) 2n = 6 . Chromosomes positioned at the metaphase plate Tetrads positioned at the metaphase plate Metaphase I Metaphase Anaphase Sister chromatids separate during anaphase Anaphase I Homologues separate during anaphase I; sister chromatids remain together Telophase Telophase I Haploid n = 3 Daughter cells of meiosis I 2n 2n MEIOSIS II Daughter cells of mitosis n n n n Daughter cells of meiosis II Sister chromatids separate during anaphase II

  4. TWO Divisions (easy version – meiosis)

  5. (First Division)

  6. (Second Division)

  7. Epididymis Seminiferous tubule Testis Cross section of seminiferous tubule Spermatogenesis Spermatogonium Sertoli cell nucleus Mitotic division, producing large numbers of spermatogonia Differentiation and onset of meiosis I Primary spermatocyte (in prophase of meiosis I) Meiosis I completed Secondary spermatocyte Meiosis II Lumen of Seminiferous tubule Early spermatids Spermatids (at two stages of differentiation) Differentiation Neck Sperm cells Tail Midpiece Head Plasma membrane Acrosome Nucleus Mitochondria

  8. Ovary Primary germ cell in embryo Differentiation Oogonium in ovary Oogonium Mitotic division Primary oocyte within follicle Oogenesis in the ovaries Primary oocyte Completion of meiosis I and onset of meiosis II Growing follicle Secondary oocyte First polar body Ovulation Mature follicle Entry of sperm triggers completion of meiosis II Ruptured follicle Second polar body Ovum Ovulated secondary oocyte Corpus luteum Degen- erating corpus luteum

  9. Crossover in Prophase I

  10. Mitosis vs. Meiosis

  11. MITOSIS MEIOSIS Chiasma (site of crossing over) Parent cell (before chromosome replication) MEIOSIS I Propase Prophase I Chromosome replication Chromosome replication Tetrad formed by synapsis of homologous chromosomes Duplicated chromosome (two sister chromatids) 2n = 6 Chromosomes positioned at the metaphase plate Tetrads positioned at the metaphase plate Metaphase I Metaphase Anaphase Sister chromatids separate during anaphase Anaphase I Homologues separate during anaphase I; sister chromatids remain together Telophase Telophase I Haploid n = 3 Daughter cells of meiosis I 2n 2n MEIOSIS II Daughter cells of mitosis n n n n Daughter cells of meiosis II Sister chromatids separate during anaphase II

  12. Key Maternal set of chromosomes Possibility 2 Possibility 1 Paternal set of chromosomes Independent Assortment Two equally probable arrangements of chromosomes at metaphase I Metaphase II Daughter cells Combination 3 Combination 2 Combination 4 Combination 1

  13. Locus(Gene locations on chromosomes)

  14. Alleles for a gene

  15. True breeds & Hybrids

  16. Phenotype vs. GenotypePhysical Trait vs. Gene allele type

  17. Dominant phenotype, unknown genotype: PP or Pp? Recessive phenotype, known genotype: pp Test Cross If Pp, then 1 2 offspring purple and 1 2 offspring white: If PP, then all offspring purple: p p p p P P Pp Pp Pp Pp P P pp pp Pp Pp

  18. Monohybrid

  19. Dihybrid

  20. Dihybrid – Normal 9:3:3:1 ratio

  21. Law of Segregation - Anaphase

  22. Key Maternal set of chromosomes Possibility 2 Possibility 1 Paternal set of chromosomes Independent Assortment Two equally probable arrangements of chromosomes at metaphase I Metaphase II Daughter cells Combination 3 Combination 2 Combination 4 Combination 1

  23. Complete Dominance

  24. Incomplete Dominance

  25. Codominance (AB) & Multiple Alleles

  26. Pleiotropy (Sickle Cell)

  27. BbCc BbCc Sperm bC Bc 1 1 1 1 BC bc 4 4 4 4 Epistasis 1 BC BBCC BbCC BBCc BbCc 4 1 bC BbCC bbCC BbCc bbCc 4 BBcc Bbcc BBCc BbCc 1 Bc 4 bbcc Bbcc 1 bbCc bc BbCc 4 9 3 4 16 16 16

  28. AaBbCc AaBbCc aabbcc Aabbcc AaBbcc AaBbCc AABbCc AABBCc AABBCC Polygenic Inheritance&Norm of the Reaction 20/64 15/64 Fraction of progeny 6/64 1/64

  29. Multifactorial example(Acid in soil changes the color)

  30. First generation (grandparents) Ww ww ww Ww Second generation (parents plus aunts and uncles) . Ww ww ww Ww Ww ww Third generation (two sisters) WW ww or Ww Widow’s peak No widow’s peak Dominant trait (widow’s peak)

  31. First generation (grandparents) Ff Ff ff Ff Second generation (parents plus aunts and uncles) FF or Ff ff ff Ff Ff ff . Third generation (two sisters) ff FF or Ff Free earlobe Attached earlobe Recessive trait (attached earlobe)

  32. Genes on Chromosomes

  33. Female (XX) Karyotype(Remember… “kary” means “nucleus”)

  34. Autosomes and linked genes

  35. Recombination frequencies Linkage Map based on Crossover frequency 9% 9.5% 17% vg b cn Chromosome

  36. Locus Gene Maps

  37. Sex –Linked Female – TWO Xs

  38. Sex-Linked Male – ONE X

  39. One from EACH parentSperm AND Egg

  40. Pedigree of Color Blindness

  41. Pedigree of Hemophila

  42. Non-Disjunction

  43. Trisomy 21

  44. Chromosome Structure Errors

  45. Extranuclear DNA(This DNA CANcan affect an organism)

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