1 / 8

From DNA to Traits

Mendelian Genetics. From DNA to Traits. Characters and Traits. Gene = Flower Color Allele = Purple or White. Dominance. Pea Plant Flower Color Gene Two purple flower alleles PP Homozygous Dominant Two white flower alleles pp Homozygous Recessive

john
Download Presentation

From DNA to Traits

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. Mendelian Genetics From DNA to Traits

  2. Characters and Traits • Gene = Flower Color • Allele = Purple or White

  3. Dominance Pea Plant Flower Color Gene Two purple flower alleles PP Homozygous Dominant Two white flower alleles pp Homozygous Recessive One purple allele, one white allele Pp Heterozygous Genotype Phenotype

  4. P p P P p p P P p p P P p p Law of Segregation • Maternal and paternal alleles of each gene separate during meiosis

  5. Punnett Square • Organizes possible gametes and offspring for a cross P: Yy♂ x Yy♀ Y = yellow seeds y = green seeds F1 Genotypes F1 Phenotypes

  6. Monohybrid Problem • Wrinkled seeds are recessive to round seeds • What percentage of the offspring of a heterozygous plant and a homozygous recessive plant would one expect to be wrinkled? P: Rr x rr R = round seeds r = wrinkled seeds F1 Genotypes F1 Phenotypes

  7. P Y P p y p y Y P P Y p p y Y y PY PY py Py Py pY py pY Law of Independent Assortment • Genes on different chromosomes assort independently

  8. Dihybrid Crosses P: PpYy♂ x PpYy♀ Y = ylw seeds y = grn seeds P = purple flowers p = white flowers F1 Genotypes F1 Phenotypes

More Related