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B variation jennifer
Genetic variation is produced within populations through mutations, sexual reproduction, and meiosis. Mutations introduce new alleles and variation when genes change through single-base mutations or chromosomal rearrangements. Sexual reproduction and meiosis increase genetic variation through recombination of alleles and independent assortment of chromosomes during mating and cell division. This genetic variation provides the raw material for natural selection to act upon.
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B variation jennifer
- 1. How is variationproduced in a population? Jennifer Oh (SL)
- 2. What is geneticvariation?
- 3. What is geneticvariation? Variation in alleles of genes
- 4. What is geneticvariation? Variation in alleles of genes Occurs within and among populations
- 5. What is geneticvariation? Variation in alleles of genes Occurs within and among populations The “raw material” of natural selection
- 6. Sources of GeneticVariation
- 7. Sources of GeneticVariation Mutations
- 8. Sources of GeneticVariation Mutations Gene mutations
- 9. Sources of GeneticVariation Mutations Gene mutations Chromosome mutations
- 10. Sources of GeneticVariation Mutations Gene mutations Chromosome mutations Sexual Reproduction
- 11. Sources of GeneticVariation Mutations Gene mutations Chromosome mutations Sexual Reproduction Recombination
- 12. Sources of GeneticVariation Mutations Gene mutations Chromosome mutations Sexual Reproduction Recombination Mate selection
- 13. Assessment Statements These arethe assessment statements that deal with this topic:
- 14. Assessment Statements These arethe assessment statements that deal with this topic: 4.1.2 Define gene, allele, and genome 4.1.3 Define gene mutation State that meiosis is a reduction division of a diploid nucleus 4.2.1 to form haploid nuclei Outline the process of meiosis, including pairing of 4.2.3 homologous chromosomes and crossing over, followed by t wo divisions, which results in four haploid cells Define genotype, phenotype, dominant allele, recessive allele, 4.3.1 codominant alleles, locus, homozygous, heterozygous, carrier and test cross
- 15.
- 16. Basic Vocabulary Before divinginto the details of genetic variation, here are some basic terms that you need to know for this topic.
- 17. Basic Vocabulary Before divinginto the details of genetic variation, here are some basic terms that you need to know for this topic. From assessment statement 4.1.2
- 18. Basic Vocabulary Before divinginto the details of genetic variation, here are some basic terms that you need to know for this topic. From assessment statement 4.1.2 Gene, Allele, Genome
- 19. Basic Vocabulary Before divinginto the details of genetic variation, here are some basic terms that you need to know for this topic. From assessment statement 4.1.2 Gene, Allele, Genome From assessment statement 4.3.1
- 20. Basic Vocabulary Before divinginto the details of genetic variation, here are some basic terms that you need to know for this topic. From assessment statement 4.1.2 Gene, Allele, Genome From assessment statement 4.3.1 Genotype, phenotype
- 21.
- 22. 4.1.2 Vocab Gene -a heritable factor that controls a specific characteristic
- 23. 4.1.2 Vocab Gene -a heritable factor that controls a specific characteristic
- 24. 4.1.2 Vocab Gene -a heritable factor that controls a specific characteristic
- 25. 4.1.2 Vocab Gene -a heritable factor that controls a specific characteristic Allele - one specific form of a gene, differing from other alleles by one or a few bases only and occupying the same gene locus as other alleles of the gene
- 26. 4.1.2 Vocab Gene -a heritable factor that controls a specific characteristic Allele - one specific form of a gene, differing from other alleles by one or a few bases only and occupying the same gene locus as other alleles of the gene
- 27. 4.1.2 Vocab Gene -a heritable factor that controls a specific characteristic Allele - one specific form of a gene, differing from other alleles by one or a few bases only and occupying the same gene locus as other alleles of the gene
- 28. 4.1.2 Vocab Gene -a heritable factor that controls a specific characteristic Allele - one specific form of a gene, differing from other alleles by one or a few bases only and occupying the same gene locus as other alleles of the gene Genome - the whole genetic information of an organism
- 29.
- 30. 4.3.1 Vocab Genotype -the alleles of an organism; determines the genetic potential
- 31. 4.3.1 Vocab Genotype -the alleles of an organism; determines the genetic potential Phenotype - the characteristics of an organism
- 32.
- 33. Mutation Mutations are thesource of all new genetic information
- 34. Mutation Mutations are thesource of all new genetic information Not always harmful, some are neutral or beneficial
- 35. Mutation Mutations are thesource of all new genetic information Not always harmful, some are neutral or beneficial Can be accumulated over many generations
- 36. Mutation Mutations are thesource of all new genetic information Not always harmful, some are neutral or beneficial Can be accumulated over many generations Gene mutation (4.1.3)
- 37. Mutation Mutations are thesource of all new genetic information Not always harmful, some are neutral or beneficial Can be accumulated over many generations Gene mutation (4.1.3) Change in the base sequence of an allele
- 38. Mutation Mutations are thesource of all new genetic information Not always harmful, some are neutral or beneficial Can be accumulated over many generations Gene mutation (4.1.3) Change in the base sequence of an allele Chromosome mutation
- 39. Mutation Mutations are thesource of all new genetic information Not always harmful, some are neutral or beneficial Can be accumulated over many generations Gene mutation (4.1.3) Change in the base sequence of an allele Chromosome mutation Pieces of chromosomes may be rearranged during meiosis
- 40.
- 41.
- 42. Sexual Reproduction Provides rearrangementand shuffling of the genetic material into new combinations
- 43. Sexual Reproduction Provides rearrangementand shuffling of the genetic material into new combinations Crossing over - Recombination
- 44. Sexual Reproduction Provides rearrangementand shuffling of the genetic material into new combinations Crossing over - Recombination Pieces of chromosome are often exchanged with a chromosome’s homologue
- 45. Sexual Reproduction Provides rearrangementand shuffling of the genetic material into new combinations Crossing over - Recombination Pieces of chromosome are often exchanged with a chromosome’s homologue Increases shuffling of allele combinations
- 46. Sexual Reproduction Provides rearrangementand shuffling of the genetic material into new combinations Crossing over - Recombination Pieces of chromosome are often exchanged with a chromosome’s homologue Increases shuffling of allele combinations Mate Selection
- 47. Sexual Reproduction Provides rearrangementand shuffling of the genetic material into new combinations Crossing over - Recombination Pieces of chromosome are often exchanged with a chromosome’s homologue Increases shuffling of allele combinations Mate Selection Different combinations of genes will come together in the offspring depending on which t wo parents mate together
- 48.
- 49. Meiosis Meiosis is areduction division of a diploid nucleus to form haploid nuclei (4.2.1)
- 50. Meiosis Meiosis is areduction division of a diploid nucleus to form haploid nuclei (4.2.1) For this topic, the important part is: crossing over
- 51. Meiosis Meiosis is areduction division of a diploid nucleus to form haploid nuclei (4.2.1) For this topic, the important part is: crossing over At Prophase I, the homologous chromosomes pair up (synapsis), and segments of the chromosome can be exchanged
- 52. Meiosis Meiosis is areduction division of a diploid nucleus to form haploid nuclei (4.2.1) For this topic, the important part is: crossing over At Prophase I, the homologous chromosomes pair up (synapsis), and segments of the chromosome can be exchanged Important source of variation for the gene pool of a population
- 53. Watch this video! GREATvideo lesson about genetic variation: http://www.khanacademy.org/video/ variation-in-a-species?playlist=Biology
- 54. i-Biology Link 4.1 Presentation http://i-biology.net/?s=4.1 4.2 Presentation http://i-biology.net/?s=4.2 4.3 Presentation http://i-biology.net/?s=4.3
- 55. More exercises For moreexercises on this topic, look at these pages from the Biozone workbook. Mutations: p. 197 - 8 Meiosis: p. 185 - 8 Genetic Variation: p. 181 - 2
- 56.