1 / 41

Genetics Week 2

Genetics Week 2. LPA 2013-2014 Standard 4 Objective 2. Monday Objective. I will explain the phases of meiosis. Bell work. Work with your table partner to find the complete and correct answers to questions #1-7 on page 198. Review Meiosis. Draw the phases of Meiosis (with the teacher).

varuna
Download Presentation

Genetics Week 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. GeneticsWeek 2 LPA 2013-2014 Standard 4 Objective 2

  2. Monday Objective • I will explain the phases of meiosis.

  3. Bell work • Work with your table partner to find the complete and correct answers to questions #1-7 on page 198.

  4. Review Meiosis • Draw the phases of Meiosis (with the teacher). • Use the slips of colored paper and the large paper to model Meiosis. • Large paper = nucleus • Desk = cell • Colored paper = chromosomes

  5. Review Fertilization Egg + Sperm = Zygote N N 2N

  6. Homework • Read pages 199-207.

  7. Tuesday Objective • I will explain how Mendel’s laws of segregation and independent assortment affect genetic inheritance.

  8. Vocabulary • Create new flashcards for the following terms: • Genetics • Heredity • Law of Segregation • Law of Independent Assortment

  9. Vocabulary Review • Review the definitions for each term below: • Gene • Allele • Dominant • Recessive • Genotype • Phenotype

  10. Reading Questions • What questions do you have after your reading last night?

  11. Heredity • The passing of ________________ from parent to offspring is called ______________. • The study of heredity in ____________ is called ____________. • __________ ___________ is the “Father of modern _____________.”

  12. Blending Inheritance Theory • During Mendel’s time, the Blending Inheritance Theory was dominant. • This theory states that _____________ were a “mix” of their ___________.

  13. Mendel’s initial observations: • Plants sometimes had offspring that were not exactly like their ____________ nor were they a _______ of their parents. • Certain traits ______________ after disappearing in an earlier ____________.

  14. Mendel’s experiments: • Subject = peas (fast growing and available in many varieties) • Study seven characteristics of pea plants: • Flower color -- Stem length • Flower position on stem -- Pod shape • Pod color -- Seed shape • Seed color

  15. Mendel’s Experiment • A ________ is a heritable variation of a characteristic. • Each trait Mendel studied occurred in _______ contrasting traits. • Short stem vs tall stem • See table at top of page 201

  16. Mendel’s Experiment • Cross-pollination: Mendel removed the anthers of the flowers in a group and dusted the stigma with stamen from a different group. • Review the diagram on page 202. • Monohybrid cross = a cross in which only one characteristic is examined

  17. Mendel’s results • See data table at bottom of page 203. • A __________ is a unit of heredity.

  18. Mendel’s Theory of Heredity • There are different versions of ______ which account for variations in ____________. • Different versions of genes are called __________. • When two different _______ are inherited together, ________ may be expressed, while the effect of the other may be “________.” • Dominant vs recessive alleles

  19. Mendel’s Theory of Heredity • For each _____________, an organism inherits ______ alleles, one from each __________. • When __________ are formed, the two alleles of each gene are separated. During __________, each gamete receives _______ allele for each trait. During fertilization, ________ fuse and the zygote contains ________ alleles for each trait.

  20. Law of Segregation • A ________ of alleles is __________, or segregated, during the formation of __________. • During __________, homologous chromosomes are randomly __________. Each resulting _______ has an equal probability of receiving either of the two _________.

  21. Mendel’s Second Experiment • Dihybrid cross = a testcross in which the ___________ of _______ characteristics is tracked at the same time. • Conclusion = _______________ are inherited independently of each other.

  22. Law of Independent Assortment • The ___________ of one trait will not affect the inheritance of another. • Modern Discovery: • Linked genes are genes that are close together on a chromosome and are packaged into the gametes _____________.

  23. Allele Combinations • Homozygous Dominant: • Both _______ are dominant (and capitalized) • Homozygous Recessive: • Both _______ are recessive (and lowercase) • Heterozygous: • One _________ allele and one __________ allele

  24. Homework • Complete questions #1-8 on page 207 of your textbook. • Read pages 208-210.

  25. Wednesday Objective • I will describe biotechnology that presents ethical issues.

  26. Bell work • Complete questions #9-14 on page 207 of your textbook.

  27. Quiz • C =NO communication except with the teacher. • H =Raise your hand and wait to speak. • A =Take the test. Answer every question. • M =Do not get out of your seat or into your bags. • P =Finish the test. When you finish, begin working on questions #1-5 on page 210.

  28. Questions • Review questions #1-5 on page 210.

  29. Homework • Read pages 211-221 in your textbook.

  30. Thursday Objective • Review Cells and Genes. • Bill Nye Videos: • Inside the living cells • Genes • (7th Period has an assembly)

  31. Friday Objective • I will demonstrate how to predict genotypes and phenotypes.

  32. Vocabulary • Create new flashcards for the following terms: • Punnett square • Testcross • Heterozygous • Homozygous • Pedigree • Sex-linked trait • Polygenic trait

  33. Reading Questions • What questions do you have after your reading last night?

  34. Punnett squares • A Punnett square is a ___________ that helps predict the probable ___________ of alleles in different crosses.

  35. Punnett square practice • Parents = one purple flower (homozygous) and one white flower. Purple color is dominant. • Parents = one purple flower (heterozygous) and one white flower.

  36. Pedigree Charts • A pedigree is a ___________ that shows the ___________ of a trait over several ______________. • Pedigrees are commonly used to track genetic __________ and _____-_______ traits.

  37. Sex-linked Traits • Sex-linked traits have alleles located on the sex ______________ (X or Y). • There are more ______-linked traits than there are _____ - linked traits. • Most sex-linked traits are _____________.

  38. Punnett square & Pedigrees • Complete the practice at the top of page 217.

  39. Non-Mendelian Modes of Inheritance • Codominance = both traits appear in a ____________ offspring. Neither allele is completely _____________ nor __________. • Incomplete Dominance = the phenotype of the offspring is somewhere in between the _____________ of both parents. A completely ____________ allele does not occur.

  40. Non-Mendelian Modes of Inheritance • Polygenic traits = traits that are affected by more than one _________. • Eye color • Skin color • Blood type

  41. Homework • Complete questions #1-7 on page 221.

More Related