2.8.1 Pedigree and Dihybrid Review

Pedigree chart

• shows how heritable traits/diseases are passed through generations

• shows how certain dog breeds are more pure based on the food they eat

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What does a filled circle represent?

• Not affected male

• Not affected female

• Affected male

• Affected female

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What does a filled in square represent?

• Not affected Female
• Not affected Male
• Affected Male
• Affected Female

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

How many generations are shown in this pedigree?

(hint the rows)

• 1
• 2
• 3
• 4

How many children did the parents in row I have?

(look closely and follow the lines)

• 1
• 2
• 3
• 4

How many grandchildren did the parents in row I have?

• 2

• 4

• 6

• 8

How many affected males does this pedigree show?

• 1
• 2
• 3
• 4

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following correctly describes the individual II-5 ?

• affected male

• unaffected male

• affected female

• unaffected female

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Shaded symbols represent individuals that express a recessive trait.

Based on the pedigree, what would be the phenotype of individual II-3?

• AA

• Aa

• aa

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Shaded symbols represent individuals that express a recessive trait.

Based on the pedigree, what would the be percent chance that an offspring from

II-3 (homozygous recessive) and II-4 (heterozygous) will be affected?

(*hint* you NEED to do a punnett square)

• 25%

• 50%

• 100%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3