1 / 13

Assignment # Mendel Loved His Peas!

Gregor Mendel, the Father of Genetics, revolutionized our understanding of heredity through his experiments with garden peas (Pisum sativum). In 1866, he meticulously bred different varieties of peas, identifying traits with distinct forms. His groundbreaking work included the development of rules predicting inheritance patterns, revealing dominant and recessive traits. By conducting monohybrid and dihybrid crosses, he demonstrated the Law of Segregation and the Law of Independent Assortment, laying the groundwork for modern genetics.

stamos
Télécharger la présentation

Assignment # Mendel Loved His Peas!

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. Assignment #Mendel Loved His Peas! Mrs. McCarthy BiologyAugust 28, 2014

  2. I. Gregor Mendel • Father of Genetics • Austrian Monk • Published his work in 1866 • Bred different varieties of garden pea, Pisum Sativum

  3. 1. Garden Peas are good subjects because: • They have many traits with two clearly different forms that are easy to tell apart • Mating can be easily controlled. (Self-pollinating or cross-pollinating) • They are small, grow easily, mature quickly and produce many offspring=QUICK RESULTS! • Don’t talk back to scientists.

  4. E. First to develop rules that accurately predict patterns of heredity 1. Heredity- passing of traits fromparents to offspring 2. Genetics- branch of biology that focuses on heredity

  5. II. Mendel’s Experiment • Step 1: He let the flowers self pollinate for several generations to get a true breeding variety • Step 2: He then cross pollinated two P generation (first individuals crossed) plants that had contrasting forms of the trait • F1 Generation- first filial generation (first babies…aww! How cute!) • Step 3: he then allowed the F1 generation to self pollinate • F2- second filial generation • RESULTS: He found a 3:1 ratio of plants expressing the contrasting traits in the F2 generation

  6. III. Crossing • Monohybrid Cross- a cross that involves one pairof contrasting traits • Ex. Flower color, wrinkled peas vs. round peas, height • Dihybrid Cross- a cross that involves two pairsof contrasting traits • Ex. Flower color AND height • True Breeding- all the offspring would display only one form of a particular trait

  7. D. Allele- different copies or forms of a gene controlling a certain trait Ex. T or t (Letters are used to represent alleles) E. Law of Segregation- two alleles for a trait separate when gametes are formed (in meiosis) F. Law of independent assortment- alleles of different genes separate independently of one another during gamete formation (also in meiosis)

  8. IV. Dominant vs. Recessive A. Dominant- the trait that is expressed 1. Shown by a CAPITAL letter Ex. T B. Recessive- the trait that is not expressed (hidden) 1. Shown by lowercase letter Ex. t C. Genotype- genetic make up Ex. Tt or TT D. Phenotype- physical trait Ex. Short or Tall

  9. E. Homozygous- two of the same alleles for that trait 1. Purebred Ex. TT or tt F. Heterozygous- two different alleles for that trait 1. Hybrid Ex. Tt

  10. r R Y y G g t T

  11. Tall Gg Heterozygous Yellow Seeds Homozygous RR Yellow pod Homozygous Round Seed

  12. Homozygous tt Heterozygous Yy Tall rr Homozygous Green seed Green Pod Homozygous

More Related