1 / 5

Probability and Punnett Squares

Probability and Punnett Squares. Probability. Probability a number that describes how likely it is something will happen Can be expressed as a ratio, fraction, or percentage When you flip a coin, you have what probability of getting heads? 1 out of 2 1 : 2 (ratio) ½ (fraction)

mandy
Download Presentation

Probability and 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. Probability and Punnett Squares

  2. Probability • Probability a number that describes how likely it is something will happen • Can be expressed as a ratio, fraction, or percentage • When you flip a coin, you have what probability of getting heads? • 1 out of 2 • 1 : 2 (ratio) • ½ (fraction) • 50% (percentage)

  3. Punnett Squares • Chart that shows all the possible outcomes of a genetic cross – allows you to determine the probability

  4. Determining genotype and phenotype ratios from a punnett square • Genotype Ratios • 1 GG : 2 Gg : 1 gg • 25% GG, 50% Gg, 25% gg • Phenotype Ratios • 3 Green : 1 white • 75% Green, 25% white

  5. Practice!!! • In chickens, brown feathers are dominant to blue. • Cross a heterozygous brown chicken with a blue chicken. Give genotype and phenotype ratios Genotypes : 50 % Bb , 50 % bb Phenotypes: 50% Brown, 50 % blue

More Related