1 / 10

Punnett Squares

Punnett Squares. The Father of Genetics. Gregor Mendel performed the first major experiments investigating heredity. Austrian Monk Was college trained in Science and Math Experimented between 1856-1863 Investigated heredity in pea plants at his monastery. Mendel’s Experiments.

leila-thornton
Download Presentation

Punnett Squares

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. Punnett Squares

  2. The Father of Genetics • Gregor Mendel performed the first major experiments investigating heredity. • Austrian Monk • Was college trained in Science and Math • Experimented between 1856-1863 • Investigated heredity in pea plants at his monastery.

  3. Mendel’s Experiments • Observed seven traits of pea plants: Plant height Pod Shape Flower Color Flower and Pod Position Seed Color Pod Color Seed Shape

  4. Crossing two plant traits • Using one trait at a time, Mendel crossed two plants who were true breeding for opposite forms of the same trait. Ex: Trait: Plant height Tall x Dwarf

  5. Punnett Square • A diagram that predicts the expected outcome of a genetic cross.

  6. Set up the Punnett Square • Write the genotypes of each parent. Put each allele (gene) in it’s own column. Then cross the alleles to determine the possible genotypes of the offspring Parent #1 Y Y y y Yy Yy Parent #2 Yy Yy

  7. Questions • How many of their offspring will be yellow? Hint: Each box is 25% 4 out of 4 – 100% (the dominant trait is stronger than the recessive trait) • How many of their offspring will be green? 0 • Are the offspring homozygous or heterozygous? heterozygous

  8. Example #2: Two plants that are heterozygous for seed color are crossed, what would their offspring look like? Yy Yy X Parent #1 Parent #2 Y y Y y YY Yy yy Yy

  9. Questions • What percent of the offspring are homozygous dominant? 1 out of 4 – 25% • What percent of the offspring are heterozygous? 2 out of 4 – 50% • What percentage of the offspring are homozygous recessive? 1 out of 4 – 25% • How many of offspring will be yellow? 75% • How many of the offspring will be green? 25%

More Related