Punnet Squares

What does a punnet square show us?

• The age of the offspring

• The chance of a genotype (trait) showing up in offspring

• Numbers

• Blue eyes

Tags

NGSS.HS-LS4-3

Which set of traits goes at the top of the punnet square?

• Father

• Mother

• Dominant

• Recessive

Genotypes are:

• Green

• Dominant only

• Recessive only

• traits that appear in offspring

Tags

NGSS.HS-LS3-1

Which is Heterozygous?

• Tt

• BB

• ff

• Dominant

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which is homozygeous?

• Tt

• BB

• Ff

• Blue

What are the chances that the offspring will have homozygous recessive traits?

• 1 in 4

• 3 out of 4

• 75%

• 50%

Tags

CCSS.7.SP.C.8B

What are the chances of heterozygous genotypes in offspring?

• 50%

• 25%

• 1 in 4

• 75%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

What is the dominant trait here?

• Bb

• Recessive eyes

• Blue eyes

• Brown eyes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

If the father's genotypes are SS and the mothers are ss, the offspring will have:

• All Ss

• Half will be SS, half ss

• Mostly SS

• Only recessive genes

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A recessive genotype will show when:

• The offspring have both dominant and recessive genotypes

• The offspring has two recessive genotypes

• The offspring have two dominant genotypes

• The mother has blue eyes

Tags

NGSS.HS-LS3-1