Mendelian genetics unit 5 lt 8 10 1
1 / 26

Mendelian genetics Unit 5 LT 8.10.1 - PowerPoint PPT Presentation

  • Uploaded on

Mendelian genetics Unit 5 LT 8.10.1. Intro to genetics. Traits. Hook - Before we begin…. ..think about this…

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about ' Mendelian genetics Unit 5 LT 8.10.1 ' - chaim-freeman

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Mendelian genetics unit 5 lt 8 10 1

Mendelian geneticsUnit 5LT 8.10.1

Intro to genetics
Intro to genetics




Hook - Before we begin…

..think about this…

  • What are some traits you have that make you look like your mom or dad? If you don’t know what your mom or dad looks like, what are some qualities that make you look unique from the rest of your family? Or do you look more like one parent than another?

  • Why do you think this is???

Jtps what color will be
JTPS - What color will be…

.. The puppy of these two dogs?


  • What genetic principles account for the transmission of traits from parents to offspring?

  • One possible explanation of heredity is a “blending” hypothesis - The idea that genetic material contributed by two parents mixes in a manner analogous to the way blue and yellow paints blend to make green

  • An alternative to the blending model is the “particulate” hypothesis of inheritance: the gene idea - Parents pass on discrete heritable units, genes

Gregor mendel

  • Austrian Monk that did research in the field of genetics during the mid 19th century

  • Genetics is the study of biological inheritance patterns and variation

  • Between 1856 and 1863 Mendel grew and tested over 28,000 pea plants

Mendel s peas
Mendel’s Peas

  • Easy to grow

  • Easily identifiable traits

  • Can work with large numbers of samples

Mendel’s research showed that genes are inherited as units called alleles.

  • Genes may be the same but the alleles (or units) may be different.

Genes for eye color

Dominant and recessive



Pure breed Purple flower


Pure breed white flower


What did he obtain?

  • Mendel allowed the F1 generation cross pollinate (mate with each other.)

  • The F2 generation showed some purple and some with white flowers.

Ratio of




  • Traits (visible characteristics) are inherited as discrete (separate and unconnected) units called alleles

Male gamete


Female gamete


Homozygous alleles
Homozygous alleles

  • Both chromosomes and alleles are the same

Heterozygous alleles
Heterozygous Alleles

  • Both chromosomes are the same, but the alleles are different

Law of segregation
Law of Segregation:

  • Organisms inherit two copies of each gene, one from each parent (the two alleles segregate/separate during gamete formation).

  • Parents donate only one copy of each gene in their gametes

Law of Segregation











  • Character: a heritable feature, such as flower color

  • Trait: a variant of a character, such as purple or white flowers

  • Each trait carries two copies of a unit of inheritance, one inherited from the mother and the other from the father

  • Alternative forms of traits are called alleles

Genetics song
Genetics song