Punnett Squares & Pedigrees

What do the circles and squares represent on a pedigree chart?

• Squares have the trait, circles are carriers.

• Squares are females, circles are males.

• Circles are females, squares are males.

• Circles have the trait, squares are carriers.

What do we use pedigrees for?

• To look at families

• To make determinations about the offspring

• To track traits in families

• Nothing

Tags

NGSS.HS-LS3-1

What is this?

• Pedigree

• Karyotype

• Venn diagram

• Punnett Square

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In the Punnett square, what belongs in the missing square?

• tt

• Tt

• TT

Tags

NGSS.HS-LS3-1

Each one of the boxes on the Punnett square represents what probability of an offspring's genotype?

• 25%

• 1%

• 10%

• 0%

Which of the following genotypes is heterozygous?

• Bb

• BB

• bb

What is the genotype probability of the offspring?

• 50% Brown

  50% Blue

• 75% Brown

  25% Blue

• 50% Bb

  50% bb

• 25% BB

  50% Bb

  25% bb

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS4-3

Cross 2 heterozygous tall pea plants. Tall (T) is dominant to short (t). What fraction of the offspring do you predict will be tall?

• 1/4

• 2/4

• 3/4

• 4/4

Tags

NGSS.HS-LS3-1

The trait this pedigree traces is recessive because it skips a generation and individuals can be carriers. What is the most likely genotype for person III-3?

• GG

• Gg

• gg

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What color eyes do the parents have?

• They both have blue

• They both have brown

• One has blue and one has brown

• Depends on how the genetics work together

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2