Genetics and Punnett Square Review

What does flipping coins have to do with genetics?

• Absolutely nothing.

• Flipping coins is fun and exciting.

• Genetics involves the probability of traits showing up in organisms.

Tags

NGSS.HS-LS3-3

NGSS.HS-LS4-3

Incomplete Dominance: On Neptune, the genotype for pink skin is Rr. It is preferable to have dominant red skin (R) versus white skin (r). A male with heterozygous pink skin will have a little Neptunian with a female that has white skin. Draw a Punnet Square to show their probability for having a red-skinned Neptunian.

• 50%

• 100%

• 0%

• 25%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Phenotypes refer to:

• Gene combinations.

• Traits that show up.

Tags

NGSS.MS-LS4-4

B = brown fur  b = white fur
In the punnett square, what is the probability for white fur? 

• 0%

• 25%

• 50%

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is the phenotype of the offspring? (A-Brown hair; a-blond hair)

• 50 % Brown Hair and 50% Blond Hair 

• 25 % Brown Hair and 75% Blond Hair 

• 75 % Brown Hair and 25% Blond Hair 

• 0% Brown Hair and 100% Blond Hair 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Heterozygous is when...

• the alleles are the same

• the alleles are different

• the alleles are absent

• the alleles are present

___________________________ is the study of how traits are passed on, or inherited.

• dominant traits

• ratio

• phenotype

• genetics

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A homozygous dominant brown mouse is crossed with a heterozygous brown mouse (tan is the recessive color).

• 100 % tan

• 100 % brown 

• 50 % brown and 50% tan 

• 75 % brown and 25 % tan 

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

G = green, g = yellow
The genotype for a yellow plant is...

• GG

• Gg

• gg

• all of the choices result in yellow

Which of the following alleles is homozygous (purebred) recessive?

• Tt

• tt

• TT

• t