Punett squares
This presentation is the property of its rightful owner.
Sponsored Links
1 / 11

PUNETT SQUARES PowerPoint PPT Presentation


  • 66 Views
  • Uploaded on
  • Presentation posted in: General

PUNETT SQUARES. How do we know what an offspring will look like?. Chance determines which genes an offspring will inherit from its parent. What is a punnett square?. Tool used to predict the phenotype of an offspring. Parent genotype is placed above and to the side of the punnett square

Download Presentation

PUNETT 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.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


Punett squares

PUNETT SQUARES


How do we know what an offspring will look like

How do we know what an offspring will look like?

  • Chance determines which genes an offspring will inherit from its parent


What is a punnett square

What is a punnett square?

  • Tool used to predict the phenotype of an offspring


How do you use a punnett square

Parent genotype is placed above and to the side of the punnett square

Place a letter into each box

Each box is equal to 25% that the trait will show up

How do you use a punnett square?


Using punnett squares

Using Punnett Squares

  • Mom’s genotype – bb

  • Dad’s genotype is bb.

    B – no dimples

    b – dimples


Punett squares

  • Dad’s genotype – BB

  • Mom’s genotype – bb

    B- no dimples

    b- dimples


Punett squares

  • Mom’s genotype –Bb

  • Dad’s genotype – bb

    B-no dimples

    b- dimples


Punett squares

  • Dad’s genotype – BB

  • Mom’s genotype – Bb

    B-no dimples

    b- dimples


Example 1

Tom is homozgous brown eye and Becky is a homozgous blue eye. Brown eyes are dominant to blue eyes.

What will the children look like?

Example 1


Example 2

Mickey Mouse is a heterozygous black fur and Minnie Mouse is a homozygous brown fur. Black fur is dominant to brown

What are the possible genotypes of each offspring?

What is the percentage for each genotypes?

Example 2


Example 3

Donald Duck and Daisy are both heterozygous for their yellow beaks. Yellow beak is dominant to an orange beak.

What are the possible genotypes?

What are the percentages for each genotype?

Example 3


  • Login