1 / 10

Genetics Notes

Genetics Notes. Heredity:. The study of genetics started with observations made by GREGOR MENDEL , a monk who noticed that pea plants passed certain traits from one generation to the next.

amir-hardin
Download Presentation

Genetics Notes

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. Genetics Notes

  2. Heredity: • The study of genetics started with observations made by GREGOR MENDEL, a monk who noticed that pea plants passed certain traits from one generation to the next. • Heredityis the passing of genes from one generation to the next. We all inherit DNA from both our parents, and their parents and so on. • DNA contains genes that code for all of our characteristics.

  3. Genes: • Provide genetic information, passed on from parents to offspring. • Genes provide traits • Ex:hair color, eye color, height, seed shape, etc.

  4. Alleles • Allelesare different forms of a trait. We use letters to represent a particular trait. Example: HeightT= Tall t= Short • Dominant Allele: Fully Expressed • (Always in Capitalized letter) • Recessive Allele: Not shown when paired with a dominant allele; only noticeable when paired with another recessive allele (Always in lower case letter)

  5. Genotype: • Is the combination of genes from each parent Homozygous = Same alleles. Ex: TT (Dominant) Same or tt(Recessive) purple PP homozygous dominant Heterozygous= Different alleles. Ex: Tt(Hybrid) different also called a CARRIER. purple Ppheterozygous

  6. Phenotype: • Is the way an organism physically looks. • Ex: Blonde hair, brown eyes, tall, purple flowers, etc. • TT or Tt= Tall phenotype • tt = Short phenotype

  7. RR Red feathers • What is the phenotype? What is the genotype?

  8. Punnett Squares • Allow us to find the probability of the genotype and phenotype passed from parents to offspring • Letters OUTSIDE of the Punnett Square are from the parents • Letters INSIDE of the Punnett Square represent the probability of the parents’ offspring’s genotypes

  9. Punnett Squares: Ex: Parents: Tt x tt (T=Tall, t=short) T tGenotype: t Tt=50% , tt= 50% Phenotype: t Tall=50%, Short=50%

  10. Can you think of any traits that identify you and the rest of your family?

More Related